Simultaneous Realization of Phase/Size Manipulation,Upconversion Luminescence Enhancement,and Blood Vessel Imaging in Multifunctional Nanoprobes Through Transition Metal Mn2+ Doping

A strategy is demonstrated for simultaneous phase/size manipulation, multicolor tuning, and remarkably enhanced upconversion luminescence (UCL), particularly in red emission bands in fixed formulae of general lanthanide‐doped upconverting nanoparticles (UCNPs), namely NaLnF₄:Yb/Er (Ln: Lu, Gd, Yb), simply through transition metal Mn²⁺‐doping. The addition of different Mn²⁺ dopant contents in NaLnF₄:Yb/Er system favors the crystal structure changing from hexagonal (β) phase to cubic (α) phase, and the crystal size of UCNPs can be effectively controlled. Moreover, the UCL can be tuned from green through yellow and to dominant red emissions under the excitation of 980 nm laser. Interestingly, a large enhancement in overall UCL spectra of Mn²⁺ doped UCNPs (～59.1 times for NaLuF₄ host, ～39.3 times for NaYbF₄ host compared to the UCNPs without Mn²⁺ doping) is observed, mainly due to remarkably enhanced luminescence in the red band. The obtained result greatly benefits in vitro and in vivo upconversion bioimaging with highly sensitive and deeper tissue penetration. To prove the application, a select sample of nanocrystal is used as an optical probe for in vitro cell and in vivo bioimaging to verify the merits of high contrast, deeper tissue penetration, and the absence of autofluorescence. Furthermore, the blood vessel of lung of a nude mouse with the injection of Mn²⁺‐doped NaLuF₄: Yb/Er UCNPs can be readily visualized using X‐ray imaging. Therefore, the Mn²⁺ doping method provides a new strategy for phase/size control, multicolor tuning, and remarkable enhancement of UCL dominated by red emission, which will impact on the field of bioimaging based on UCNP nanoprobes.     

Fluorescence enhancement of single-phase red-blue emitting Ba3MgSi2O8:Eu2+,Mn2+ phosphors via Dy3+ addition for plant cultivation

Fluorescence enhancement of red and blue concurrently emitting Ba₃MgSi₂O₈:Eu²⁺,Mn²⁺ phosphors for plant cultivation has been investigated by Dy³⁺ addition. The Ba₃MgSi₂O₈:Eu²⁺,Mn²⁺,Dy³⁺(BMS-EMD) phosphors have two-color emissions at the wavelength peak values of 437 nm and 620 nm at the excitation of 350 nm. The two emission bands are coincident with the absorption spectrum for photosynthesis of plants. An obvious enhancement effect has been observed upon addition of Dy³⁺ with amount of 0.03 mol%, in which the intensities of both blue and red bands reach a maximum. The origin of red and blue emission bands is analysed. The photochromic parameters of the samples at the nearly UV excitation are tested. This fluoresence enhancement is of great significance for special solid state lighting equipment used in plant cultivation. This work has been supported by National Natural Science Foundation of China (Grant No 50872091) and the Natural Science Foundation of Tianjin, China (06YFJMJC02300, 06TXTJJC14602).     

A Single-Composition Trichromatic White-Light-Emitting Phosphor Based on Sr<Subscript>8</Subscript>ZnY(PO<Subscript>4</Subscript>)<Subscript>7</Subscript> Coactivated with Ce<Superscript>3+</Superscript>, Tb<Superscript>3+</Superscript>, and Mn<Superscript>2+</Superscript>

Ce³⁺/Tb³⁺/Mn²⁺-codoped Sr₈ZnY(PO₄)₇ (SZYP) white-emitting phosphors have been synthesized via solid-state reaction technology. The overlapping spectra between the excitation bands of Mn²⁺ and Tb³⁺ ions and the emission band of Ce³⁺ suggest that Ce³⁺ → Mn²⁺ and Ce³⁺ → Tb³⁺ energy transfer occurs. The emission hues exhibited by Ce³⁺/Tb³⁺- and Ce³⁺/Mn²⁺-codoped phosphors could be modulated from bluish to greenish region and from bluish to reddish region by simply adjusting the relative content of Ce³⁺/Tb³⁺ and Ce³⁺/Mn²⁺, respectively. SZYP:Ce³⁺,Tb³⁺,Mn²⁺ samples exhibited three dominant bands at 410 nm, 545 nm, and 600 nm, attributable to electronic transitions of Ce³⁺, Tb³⁺, and Mn²⁺ ions, respectively. Thus, color-tunable emission was achieved by accurately modulating the concentrations of Ce³⁺, Tb³⁺, and Mn²⁺ ions. SZYP:0.05Ce³⁺,0.11Mn²⁺,0.11Tb³⁺ was found to be an ideal white-light-emitting phosphor with color coordinates of (0.34, 0.33) and correlated color temperature of about 5144.83 K. The results indicate that Ce³⁺/Tb³⁺/Mn²⁺ -tridoped SZYP phosphors are potential single-component white-emitting candidates for application in ultraviolet- and white-light-emitting diodes.     

Direct white-light from core-shell-like sphere with Sr3Mg-Si2O8: Eu2+, Mn2+ coated on Sr2SiO4:Eu2+

A method of color mixture for white light is presented with Sr3MgSi2O8:Eu2+, Mn2+ shell coated on Sr2SiO4:Eu2+ core by spray pyrolysis procedure. Upon near ultraviolet (NUV) excitation, a 550 nm band emission of Eu2+ from core host combines with the simultaneous emissions of Eu2+ at 457 nm and Mn2+ at 683 nm based on energy transfer in the shell lattice to generate warm white light with color rendering index (CRI) of 91. With such a core-shell-like structure, the re-absorption of blue light from shell layer can be effectively suppressed, and the chemical stability of the phosphor is verified experimentally to be superior to that of the Sr2SiO4:Eu2+. This new proposed phosphor provides great potential in the color mixture of blending-free phosphor converted white NUV light emitting diode (LED) devices.     

Electron Paramagnetic Resonance and Photoluminescence Studies of LaMgAl11O19:Mn2+ Green Phosphors

Manganese-doped LaMgAl₁₁O₁₉ powder has been prepared by an easy combustion method. Powder x-ray diffraction and scanning electron microscopy have been used to characterize the as-prepared phosphor. The electron paramagnetic resonance (EPR) spectrum of LaMgAl₁₁O₁₉:Mn²⁺ phosphor exhibits six-line hyperfine structure centered at g ≈ 1.973. The number of spins participating in resonance (N) and the paramagnetic susceptibility (χ) for the resonance signal at g ≈ 1.973 have been calculated as a function of temperature. The photoluminescence spectrum exhibits green emission at 516 nm, which is attributed to ⁴T₁ → ⁶A₁ transition of Mn²⁺ ions. From EPR and luminescence studies, it is observed that Mn²⁺ ions occupy Mg²⁺ sites and Mn²⁺ ions are located at tetrahedral sites in the prepared phosphors.     

Evidence that Crystal Facet Orientation Dictates Oxygen Evolution Intermediates on Rutile Manganese Oxide

Elucidating the mechanism that differentiates the oxygen‐evolving center of photosystem II with its inorganic counterpart is crucial to develop efficient catalysts for the oxygen evolution reaction (OER). Previous studies have suggested that the larger overpotential for MnO₂ catalysts under neutral conditions may result from the instability of the Mn³⁺ intermediate to charge disproportionation. Here, by monitoring the surface intermediates of electrochemical OER on rutile MnO₂ with different facet orientations, a correlation between the stability of the intermediate species and crystal facets is confirmed explicitly for the first time. The coverage of the Mn³⁺ intermediate is found to be 11‐fold higher on the metastable (101) surfaces compared to (110) surfaces, leading to the superior OER activity of (101) surfaces. The difference in OER activity may result from the difference in surface electronic states of Mn³⁺, where interlayer charge comproportionation of Mn²⁺ and Mn⁴⁺ to generate two Mn³⁺ species is favored on (101) facets. Considering the fact that the OER enzyme accommodates Mn³⁺ stably during the Kok cycle, the enhanced OER activity of the rutile MnO₂ catalyst with a metastable surface highlights the importance of mimicking not only the crystal structure but also the electronic structure of the targeted natural enzyme.     

Structure,cation valence states and electrochemical properties of nanostructured Mn3O4

Nanostructured Mn₃O₄ with an average crystallite of ~10 nm is synthesized by the controlled reduction of potassium permanganate using hydrazine. The phase purity, average crystallite/particle size, morphology and state of agglomeration were studied using X-ray diffraction (XRD), Transmission Electron microscopy (TEM) and Scanning Electron Microscopy (SEM) analyses. Nitrogen sorption studies give a specific surface area of 62 m²/g and also reveal the mesoporous nature. The presence of Mn⁴⁺ ions is inferred from the Fourier Transform Infra-Red (FTIR) spectroscopy and X-ray Photoelectron Spectroscopy (XPS) studies. The decrease in the c/a ratio obtained from XRD analysis also indicates the presence of Mn⁴⁺ ions. Electrochemical analysis was done on a symmetric capacitor with nanostructured Mn₃O₄ as the active material and 6 M KOH solution as the electrolyte. Cyclic voltammograms revealed pseudocapcitive behavior with specific capacitance values falling sharply with scan rate. The power density and energy density values obtained from chornopotentiograms are fairly large and indicate the potential application in the field of supercapacitors.     

Combined First‐Principle Calculations and Experimental Study on Multi‐Component Olivine Cathode for Lithium Rechargeable Batteries

The electrochemical properties and phase stability of the multi‐component olivine compound LiMn_1/3Fe_1/3Co_1/3PO₄ are studied experimentally and with first‐principles calculation. The formation of a solid solution between LiMnPO₄, LiFePO₄, and LiCoPO₄ at this composition is confirmed by XRD patterns and the calculated energy. The experimental and first‐principle results indicate that there are three distinct regions in the electrochemical profile at quasi‐open‐circuit potentials of ～3.5 V, ～4.1 V, and ～4.7 V, which are attributed to Fe³⁺/Fe²⁺, Mn³⁺/Mn²⁺, and Co³⁺/Co²⁺ redox couples, respectively. However, exceptionally large polarization is observed only for the region near 4.1 V of Mn³⁺/Mn²⁺ redox couples, implying an intrinsic charge transfer problem. An ex situ XRD study reveals that the reversible one‐phase reaction of Li extraction/insertion mechanism prevails, unexpectedly, for all lithium compositions of Li_xMn_1/3Fe_1/3Co_1/3PO₄ (0 ≤ x ≤ 1) at room temperature. This is the first demonstration that the well‐ordered, non‐nanocrystalline (less than 1% Li–M disorder and a few hundred nanometer size particle) olivine electrode can be operated solely in a one‐phase mode.     

Luminescence properties of a solid solution typed （Ba,Ca）3MgSI2O8： Eu2＋ , Mn 2＋ phosphor with a 660 nm- featured photosynthetic action spectrum

A solid-solution-phase Ba1.75Ca1.25MgSi2O8： Eu2＋, Mn2＋ phosphor in the photosynthetic action spectrum with dual band emissions at 438 nm and 660 nm is fabricated. X-ray diffraction （XRD） confirms the presence of the solid-solution phase. With the supporting information from the diffuse reflection spectrum, a feasible way to obtain higher energy-transfer （ET） efficiency is attained, and the ET efficiency of Eu2＋-Mn2＋ is enhanced to 76%. The mechanism of this enhancement is owing to variation of the solid solution composition of Ca3MgSi208 and Ba3MgSi2Os, which contributes to the extension of the critical distance. Temperature-dependent results show an en- hancement which is attributed to Ca. These enhancements show great promise for improving coo-lighting devices.     

Effect of annealing on the microwave magnetoresistance of thin Ge<Subscript>0.96</Subscript>Mn<Subscript>0.04</Subscript> films

It is established that annealing of ion-implanted thin Ge_0.96Mn_0.04 films with a thickness of 120 nm induces an increase in the microwave resistivity and a change in the mechanism of dephasing of charge carriers. The effect of annealing on the microwave transport properties of the thin films is due to the diffusion-controlled aggregation of dispersed Mn²⁺ impurity ions to form Ge₃Mn₅ clusters.     

Sufficient Utilization of Mn2+/Mn3+/Mn4+ Redox in NASICON Phosphate Cathodes towards High-Energy Na-Ions Batteries

Na superionic conductor of Na₃MnTi(PO₄)₃ only containing high earth-abundance elements is regarded as one of the most promising cathodes for the applicable Na-ion batteries due to its desirable cycling stability and high safety. However, the voltage hysteresis caused by Mn²⁺ ions resided in Na⁺ vacancies has led to significant capacity loss associated with Mn reaction centers between 2.5–4.2 V. Herein, the sodium excess strategy based on charge compensation is applied to suppress the undesirable voltage hysteresis, thereby achieving sufficient utilization of the Mn²⁺/Mn³⁺ and Mn³⁺/Mn⁴⁺ redox couples. These findings indicate that the sodium excess Na_3.5MnTi_0.5Ti_0.5(PO₄)₃ cathode with Ti⁴⁺ reduction has a lowest Mn²⁺ occupation on the Na⁺ vacancies in its initial composition, which can improve the kinetics properties, finally contributing to a suppressed voltage hysteresis. Based on these findings, it is further applied the sodium excess route on a Mn-richer phosphate cathode, which enables the suppressed voltage hysteresis and more reversible capacity. Consequently, this developed Na_3.6Mn_1.15Ti_0.85(PO₄)₃ cathode achieved a high energy density over 380 Wh kg⁻¹ (based on active substance mass of cathode) in full-cell configurations, which is not only superior to most of the phosphate cathodes, but also delivers more application potential than the typical oxides cathodes for Na-ion batteries.     

A Manganese Phosphate Cathode for Long-Life Aqueous Energy Storage

Mn-based materials for aqueous energy storage are reaching the capacity ceiling due to the limited Mn⁴⁺/Mn³⁺ redox. The disproportionation of Mn³⁺ often occurs, forming soluble Mn²⁺ and thus leading to severer capacity decays. Here, an amorphous manganese phosphate material [AMP, Na_1.8Mn₄O_1.4(PO₄)₃] is fabricated using an electrochemical method for the first time. Benefitting from the open framework and the insoluble nature of Mn²⁺ in AMP, the Mn³⁺/Mn²⁺ and Mn⁴⁺/Mn³⁺ redox couples can participate in the charge storage processes. The AMP electrode shows a high capacity of 253.4 mAh g⁻¹ (912.4 F g⁻¹ or 912.4 C g⁻¹) at the current density 1 A g⁻¹ and good rate capability. Experimental results indicate AMP experiences a mixed charge storage mechanism (i.e., cation intercalation and conversion reactions) in Na₂SO₄ electrolyte. Besides, electrolyte engineering can effectively prevent the decomposition of AMP during cycling test, achieving capacity retention of 97% in 5000 cycles. Importantly, AMP can accommodate different cations (e.g., Mg²⁺, Ca²⁺, etc.), exhibiting great potential for aqueous energy storage.     

Interaction between magnons and impurity excitations in CoCO3+10−4 Mn2+ and CoF2+4×10−3 Mn2+

Interaction of host magnons with impurity magnetic excitations in antiferromagnetic crystals CoCO₃ and CoF₂ containing substitutional impurity amounting to 10^?4 and (4±2)×10^?3 (by weight) Mn²⁺ respectively, has been investigated in the wavelength range 0.35–0.8 mm in a magnetic field of up to 20 T. In the CoCO₃+10^?4 Mn²⁺ crystal the impurity line was observed to merge with the AFMR line, which is peculiar to incoherent spectrum rearrangement. In the CoF₂+4×10^?3 Mn²⁺ crystal the cross splitting of spectrum was revealed as the impurity lower lying Zeeman level approached the AFMR low frequency mode, peculiar to coherent spectrum rearrangement. In both cases the impurity line intensity increases very much as it approaches the spin-wave band of the crystal. The constant of resonance interaction of the impurity excitation with magnons is determined for CoF₂+Mn²⁺ to be m=18 cm^?1.     

Observation of lasing from Cr2+:CdTe and compositional effects in Cr2+-doped II-VI semiconductors

We are engaged in a systematic study of the optical and laser properties of Cr²⁺-doped cadmium chalcogenides. Previously, we demonstrated quasi-continuous wave lasing from Cr²⁺-doped Cd_0.55Mn_0.45Te with slope efficiencies as high as 64% and a laser tuning range from 2,170–3,010 nm. In this paper, we report the first demonstration of lasing from Cr:CdTe at room temperature. Pulsed-laser operation was obtained with a free-running spectrum centered at 2,535 nm. The slope efficiency of the laser was low (∼1%) because of large parasitic losses at the laser wavelength. The spectroscopic properties of Cr:CdTe are favorable for laser applications because of a large emission cross section (∼2.5 × 10⁻¹⁸ cm²) and a high emission-quantum yield (∼88%). In addition, CdTe can easily incorporate Cr ions either through melt growth or diffusion doping. Along with our results on Cr²⁺:CdTe, we report on the optical properties of several other Cr²⁺-doped II-VI semiconductors (ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, Cd_0.9Zn_0.1Te, Cd_0.65Mg_0.35Te, Cd_0.85Mn_0.15Te, and Cd_0.55Mn_0.45Te) and compare them for applications as solid-state laser materials.     

Pressure‐Driven Eu2+‐Doped BaLi2Al2Si2N6: A New Color Tunable Narrow‐Band Emission Phosphor for Spectroscopy and Pressure Sensor Applications

A series of BaLi₂Al₂Si₂N₆ (BLASN): xEu²⁺ phosphors are successfully synthesized and their crystal structure and luminescence properties under varying hydrostatic pressures are reported herein. Structure variation is analyzed using in situ high‐pressure X‐ray diffraction and Rietveld refinements. Based on decay curves and Gaussian fitting of emission spectra, the presence of two photoluminescence centers is demonstrated. BaLi₂Al₂Si₂N₆: 0.01Eu²⁺ exhibits an evident peak position shift from 532 to 567 nm with an increase in pressure to ≈20 GPa. The possible factors and mechanisms for the variations are studied in detail. At a pressure of 16 GPa, BLASN: Eu²⁺ realizes a narrow yellow emission with a full width at half maximum of ≈70 nm. The addition of BLASN: Eu²⁺ (16 GPa) to the commercial white light‐emitting diodes combination consisting of an InGaN chip, β‐SiAlON: Eu²⁺, and red K₂SiF₆:Mn⁴⁺, can increase the color gamut by ≈15%, demonstrating the promising potential of pressure‐driven BLASN: Eu²⁺ for wide‐color gamut spectroscopy applications. Moreover, the emission shifts arising from pressure variation and the distinct color changes enable its potential utility as an optical pressure sensor; the material exhibits high pressure sensitivity (dλ/dP ≈ 1.58 nm GPa^?1) with the advantage of visualization.     

Er3+–Tm3+ co-doped tellurite fibers for broadband optical fiber amplifier around 1550 nm band

Tellurite fibers with 7500 ppm Er³⁺ concentration and diverse 2500–15,000 ppm Tm³⁺ concentrations were manufactured, and their amplified spontaneous emission (ASE) intensities 1550 nm band around were obtained for 980 and 790 nm pump laser. Maxima 187 nm bandwidth at −3 dB points using Er³⁺–Tm³⁺ co-doped tellurite optical fibers pumping at 790 nm was obtained, and energy transfer (ET) process between ⁴I_13/2 Er³⁺ and ³F₄ Tm³⁺ levels related with the amplifier quantum efficiency was studied from experimental and calculated lifetime.     

Full Color Emission in ZnGa2O4: Simultaneous Control of the Spherical Morphology,Luminescent, and Electric Properties via Hydrothermal Approach

ZnGa₂O₄ and ZnGa₂O₄: Mn²⁺/Eu³⁺ with uniform nanosphere (diameter about 400 nm) morphology have been synthesized via a facile hydrothermal approach. XRD, Raman spectra, XPS, FT‐IR, SEM, TEM, photoluminescence (PL), and cathodoluminescecne (CL) spectra are used to characterize the resulting samples. The controlled experiments indicate the dosage of trisodium citrate and pH values are responsible for shape determination of the ZnGa₂O₄ products. The possible fast crystallization–dissolution–recrystallization formation mechanism for these nanospheres is presented. Under UV light and low‐voltage electron beam excitation, ZnGa₂O₄, ZnGa₂O₄: Mn²⁺ and ZnGa₂O₄: Eu³⁺ emit bright blue, green, and red luminescence, respectively. Based on density functional theory calculations from first principles, the green and red emission are caused by the Mn 3d and Eu 4f electronic structures, respectively. Besides, the dependence of the CL intensity on the calcination temperature and electrical conductivity of the samples is presented. The ZnGa₂O₄: Mn²⁺ nanospheres have a higher CL intensity than that of bulk samples under the same excitation condition. The realization of three primary colors from a single host material suggests that full color display based on ZnGa₂O₄ nanospheres might be achievable, showing that these materials have potential applications in lighting and display fields.     

Performance Enhancement and In Situ Observation of Resistive Switching and Magnetic Modulation by a Tunable Two-Level System of Mn Dopants in a-Gallium Oxide-based Memristor

Purely gallium oxide-based memristors (GOMRs) show great potentials in resistive random-access-memory (RRAM) due to their chemical stability and resistive switching characteristics with R_off/R_on ratios up to 10²; indeed, GOMRs with higher R_off/R_on ratios and more functionalities are more expected. In this study, ferromagnetic amorphous gallium oxide (a-GMO) films with a tunable two-level system of Mn dopants, i.e., Mn²⁺ and Mn³⁺ ions, are prepared by scalable polymer assisted deposition. The Pt/a-GMO/Pt memristors show a high R_off/R_on ratio of 10³, at least one order of magnitude higher than those of previously reported purely GOMRs, thanks to the abundant oxygen vacancies (V_Os)-induced low resistance state and Mn²⁺-enhanced high resistance state. Meanwhile, magnetic modulation (MM) is realized electrically in the a-GOMRs during the RS, through the tuning of bound magnetopolarons (BMPs) by bias voltage-induced V_Os variations, which may be useful for quaternary information coding. Notably, the transition between Mn³⁺ and Mn²⁺ions is observed in the GOMRs, which is closely related to the variations of V_O concentration and BMP amount, providing an in situ tool to probe the V_O-induced RS and BMP-dependent MM. The results give insights to Mn-doped GOMRs and may be useful for design, fabrication, and testing of multifunctional high-performance RRAMs.     

Stress-Triggered Mechanoluminescence in ZnO-Based Heterojunction for Flexible and Stretchable Mechano-Optics

Owing to the forthcoming global energy crisis, the search for energy-saving materials has intensified. Over the past two decades, mechanically induced luminescent materials have received considerable attention as they can convert waste into useful components, for instance, the conversion from stress into light. However, this material features many constraints that limit its widespread application. Herein, a strategy to improve the mechanoluminescence (ML) of ZnO by embedding it in a ZnF₂:Mn²⁺ matrix is introduced. Upon dynamic excitation via an external stress, the reddish-yellow ML is confirmed to originate from the ⁴T₁ (4G) → ⁶A₁ (6S) transition of the optically active Mn²⁺ center. Moreover, the sample with the strongest ML contains the appropriate amount of ZnF₂ (ZnF₂:ZnO = 7:3). By performing density functional theory calculations, a possible ML-enhancement mechanism is elucidated, which indicates the formation of a ZnF₂/ZnO:Mn²⁺ heterojunction. Considering the unique characteristics of ML, its promising applications are demonstrated in various mechano-optics scenarios, including flexible and stretchable optoelectronics, advanced self-powered displays, e-skins/e-signatures, and anti-counterfeiting, without the use of external light/electric-incentive sources. The study significantly increases the variety of ML materials and is expected to strengthen the foundation for the future development of smart mechanically controlled devices and energy-saving systems.     

Synthesis of Luminescent ZrO2:Eu3+ Nanoparticles and Their Holographic Sub‐Micrometer Patterning in Polymer Composites

Here, the facile synthesis of fluorescent ZrO₂:Eu³⁺ nanoparticles with luminescence quantum yield of up to 8.7% that can be easily dispersed in organic solvents and utilized for the preparation of organic/inorganic volume holographic gratings is presented. The nanoparticles are prepared through a one‐step solvothermal process resulting in spherical particles with a mean size of 4 nm that were highly crystalline directly after the synthesis, without any need for calcination treatment. Detailed luminescence studies of the nanoparticles as a function of Eu³⁺ content demonstrate that the dopant concentration and its site symmetry play an important role in the emissive properties and lifetime of the luminescent centers. It is shown that the luminescence quantum yield of the colloidal ZrO₂:Eu³⁺ nanoparticles increases with dopant concentration up to a critical concentration of 11 mol% while the luminescence lifetime is shortened from 1.8 to 1.4 ms. Holographic photopolymerization of suitable monomer mixtures containing the luminescent nanoparticles demonstrated the ability to inscribe volume Bragg gratings (refractive index contrast n₁ up to 0.011) with light‐emissive properties, evidencing the high suitability of this approach for the fabrication of tailored nanomaterials for elaborate and demanding applications.