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1.
Nur Alia Sheh Omar Yap Wing Fen Khamirul Amin Matori Mohd Hafiz Mohd Zaid Mohd Rasdi Norhafizah Mohammad Nurzilla Mohd Ismail Maisarah Zamratul 《Journal of Materials Science: Materials in Electronics》2016,27(2):1092-1099
This paper presents a study on synthesis and optical properties of Zn2SiO4:1 wt% Eu3+ at different heat treatments. The objective of the research is to synthesize Zn2SiO4:1 wt% Eu3+ phosphor by using low cost solid state reaction method with recycled waste bottle glasses as the silicate source. The X-ray diffraction results showed that the prepared Zn2SiO4:1 wt% Eu3+ phosphors have a sharp diffraction peak as the heat treatment temperatures were increased from 600 to 1000 °C. Furthermore, the morphology from the Field emission scanning electron microscope analysis were shown the formation of well crystalline samples with dense packed grains due to the increment of heat treatment temperatures. Fourier transform infrared spectra has confirmed the present elements in Zn2SiO4:1 wt% Eu3+ phosphors while the narrow width of Raman line spectra were observed at temperatures ranging from 700 to 1000 °C indicates good homogeneity and crystallinity of synthesized powders. In addition, the energy band gap of europium doped zinc silicate increased dramatically up to 3.62 eV at temperature of 1000 °C. Photoluminescence measurements has also exhibited the red emission corresponding to the 5D0 → 7F2 (600 nm) when viewed under blue excitation. 相似文献
2.
Aoyang Yu Dong Zhang Yafei Hu Ruiqin Yang 《Journal of Materials Science: Materials in Electronics》2014,25(10):4434-4438
Sr3Al2O6:Eu2+, Dy3+ phosphors were synthesized by the polymer precursor method. The X-ray powder diffraction patterns show that the samples have a cubic structure with a space group of Pa3. In the excitation spectrum, the phosphors show a wide absorption in the UV region from 250 to 450 nm, which corresponds to the crystal field splitting of the Eu2+ d-orbital. All the emission spectrum of Sr3Al2O6:Eu2+, Dy3+ phosphors show the broad band emission peaked at about 518 nm, which can be ascribed to the typical 4f65d1 → 4f7 transitions of Eu2+ ions. And the best dopant concentration of Dy3+ ions for Sr3Al2O6:2 mol%Eu2+, xDy3+ phosphors is 2 mol%. The excitation wavelengths have no influences on emission peaks, but have clear influences on emission intensities. 相似文献
3.
Anthuvan John Peter I. B. Shameem Banu Jagannathan Thirumalai Samuel Paul David 《Journal of Materials Science: Materials in Electronics》2013,24(11):4503-4509
For the first time, CaMoO4: xEu3+ (x = 0.02, 0.04, 0.06, 0.08, 0.1) red phosphor nanoparticles were synthesized using the simple mechanochemically assisted solid state meta-thesis (SSM) reaction method and the luminescence properties as a function of Eu3+ ion concentration was investigated. The characteristics of the phosphor materials were analyzed using X-ray diffraction, fourier transform infrared spectroscopy, photoluminescence (PL) and diffuse reflectance spectroscopy. For 8 mol% of Eu3+ concentration, the phosphor shows an intensified excitation peak at 392 nm indicating a strong absorption. The PL emission spectra of CaMoO4: Eu3+ phosphors showed an intense peak at 615 nm (red) which corresponds to 5D0 → 7F2 transition of Eu3+. The optimal Eu3+ concentration in CaMoO4 phosphors for enhanced red emission occurs for 8 mol% and above this concentration, the emission intensity decreases due to quenching effect. The CIE colour coordinates of the CaMoO4: 0.08Eu3+ red phosphor coincide very well with the standard values of NTSC. The red emission intensity of the SSM prepared CaMoO4: 0.08Eu3+ red phosphor is 4.7 times greater than that of the commercial Y2O2S: Eu3+ red phosphor and 1.6 times more than the same phosphor prepared by the solid state reaction method. 相似文献
4.
Yanxia Tang Yongfei Ye Haihui Liu Xiongfei Guo Hongxia Tang Wenzhong Yin Yaping Gao 《Journal of Materials Science: Materials in Electronics》2017,28(2):1301-1306
NaLa(WO4)2:Eu3+ phosphors with different Eu3+ concentrations have been synthesized by a hydrothermal method. The phase is confirmed by XRD analysis, which shows a pure-phase NaLa(WO4)2 XRD pattern for all of NaLa(WO4)2:Eu3+ phosphors. The SEM and TEM images indicate that all of NaLa(WO4)2:Eu3+ phosphors have a octahedral morphology. These suggest that the Eu3+ doping has no influence on the structure and growth of NaLa(WO4)4 particles. By monitoring the emission of Eu3+ at 615 nm, NaLa(WO4)2:Eu3+ phosphors show excitation bands originating from both host and Eu3+ ions. Under the excitation at 271 nm corresponding to WO4 2? groups, emission bands coming from the 1A1 → 3T1 transition with the WO4 2? groups and the 5D0 → 7Fj (j = 0, 1, 2, 3 and 4) transitions of Eu3+ are observed. The emission intensity relating to WO4 2? groups decreases with increasing Eu3+ concentration. But emission intensities of Eu3+ increase firstly and then decreases because of concentration quenching effect. Under the excitation at 395 nm corresponding to 7F0 → 5L6 transition of Eu3+, only characteristic Eu3+ emission bands can be observed. The results of this work suggest that tunable luminescence can be obtained for Eu3+ doped NaLa(WO4)2 phosphors by changing Eu3+ concentration and excitation wavelength. 相似文献
5.
Sonika Singh S. P. Khatkar Priti Boora V. B. Taxak 《Journal of Materials Science》2014,49(14):4773-4779
Eu3+-doped GdSrAl3O7 nanophosphor with promising luminescent properties has been synthesized by low-temperature solution combustion synthesis. The structural properties examined by X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy showed that pure tetragonal GdSrAl3O7: Eu3+ red nanophosphor having narrow size distribution in 50–55 nm range could be readily obtained at low temperature 550 °C. The photoluminescent excitation and emission spectra, life time, and concentration effect were studied in detail. Under excitation at 266 nm, Eu3+-doped GdSrAl3O7 nanophosphor revealed weak green emission and strong red emission attributed to 5D1 → 7F1–2 and 5D0 → 7F0–3 transitions of Eu3+ ion, respectively in the region of 525–700 nm. The red emission from 5D0 → 7F2 transition at 616 nm exhibits the highest intensity under the optimized concentration of 10 mol% after which the quenching mechanism became relevant. Quenching behavior of the europium in the GdSrAl3O7 host was explained by nonradiative cross-relaxation phenomenon. Moreover, Eu3+-doped GdSrAl3O7 nanophosphor can generate light from orange to deeper red by properly tuning the concentration of europium ions based on the energy transfer principle. 相似文献
6.
Qingling Kong Jinxian Wang Xiangting Dong Wensheng Yu Guixia Liu 《Journal of Materials Science: Materials in Electronics》2013,24(12):4745-4756
LaOCl:Eu3+ nanofibers, nanobelts and nanotubes were prepared by electrospinning combined with a double-crucible chlorination technique using NH4Cl as chlorinating agent. Different morphologies of LaOCl:Eu3+ were obtained via adjusting some of the electrospun parameters. X-ray powder diffraction analysis indicated that LaOCl:Eu3+ nanostructures were tetragonal with space group P4/nmm. Scanning electron microscope analysis and histograms revealed that diameters LaOCl:Eu3+ nanofibers and nanotubes, and the width of LaOCl:Eu3+ nanobelts were respectively 198.64 ± 15.07, 168.86 ± 24.70 and 2.103 ± 0.3345 μm under the 95 % confidence level. Transmission electron microscope observation showed that as-obtained LaOCl:Eu3+ nanotubes were hollow-centered structure. Photoluminescence (PL) analysis manifested that the LaOCl:Eu3+ with different morphologies emitted the predominant emission peaks at 616 and 618 nm originating from the transition 5D0 → 7F2 of Eu3+ ions under the excitation of 283-nm ultraviolet light. It was found that the optimum molar ratio of Eu3+/(La3++Eu3+) ions was 5 %. LaOCl:Eu3+ nanobelts exhibited the strongest PL intensity of the three morphologies under the same doping concentration. CIE analysis demonstrated that color-tuned luminescence can be obtained by changing doping concentration of Eu3+ ions and morphologies of nanomaterials, which could be applied in the fields of optical telecommunication and optoelectronic devices. The possible formation mechanisms of LaOCl:Eu3+ nanofibers, nanobelts and nanotubes were also proposed. 相似文献
7.
Tricolor emission Ca2SiO4:Ln (Ln = Ce3+, Eu2+, Sm3+) phosphors were synthesized by the conventional solid-state reaction method, and their photoluminescence properties were investigated. Ce3+-, Eu2+-, or Sm3+-doped Ca2SiO4 phosphors showed typical blue, green, or red luminescence in the CIE1931 chromaticity diagram, respectively. In addition, the luminescence efficiency of the tricolor emission Ca2SiO4:Ln (Ln = Ce3+, Eu2+, Sm3+) phosphors was evaluated. A series of white light-emitting diode (LED) prototypes were fabricated by combining near-UV LED chip and the as-prepared tricolor emission phosphors with various ratios in weight. White LED prototypes with tunable correlated color temperature and color-rendering index values were realized by controlling the amount of phosphors. The presented results indicated the potential application of Ca2SiO4:Ln (Ln = Ce3+, Eu2+, Sm3+) phosphors in near-UV white LED. 相似文献
8.
In the present investigation, we have demonstrated the synthesis of sphere shaped HA phosphors by a simple one-step hydrothermal method, and the structural, morphological, textural and optical properties were characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that the crystal size and the ratio of length to radius of Eu3+-doped HA particles decreased with the increasing of Eu3+doped concentration, and its PL emission intensities increased with the increase of Eu3+doped concentration. When the Eu3+ amount was 7.5 at.%, the HA particle showed sphere shape, and the actual doping concentration and the PL emission intensities reach the maximum. This indicated that sphere shaped HA phosphors can be obtained by adjusting the Eu3+ doping concentration without adding any other reagent. And it also indicated that the PL emission intensities were mainly dependent on the Eu3+ doped concentration, and the effect of morphology was very little. 相似文献
9.
In this study, YPO4:Eu3+ microspheres with different Eu3+ dosage concentration were fabricated by a facile hydrothermal route at 200 °C for 10 h in the presence of citric acid. The YPO4:Eu3+ samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and luminescence spectroscopy. The XRD results reveal that the YPO4:Eu3+ samples presented a tetragonal structure. The TEM and SEM observations demonstrate that the YPO4:Eu3+ samples with uniform sphere-like morphologies can be obtained at 200 °C for 10 h. The sizes of samples are in the range of 2–2.2 μm. The room temperature luminescence properties of YPO4:Eu3+ samples were studied using an excitation wavelength of 227 nm. The emission spectrum displays the bands associated to the 5D0 → 7FJ (J = 1, 2 and 4) electronic transitions characteristics of the Eu3+ cations at different positions. The influence of Eu3+ dosage concentration on luminescence properties of YPO4:Eu3+ microspheres were studied carefully. 相似文献
10.
Thermally stimulated luminescence and photoluminescence investigations of Eu3+ and Eu2+ doped SrBPO5
Thermally stimulated luminescence (TSL) investigations of SrBPO5:Eu3?+ and SrBPO5:Eu2?+ phosphors were carried out in the temperature range of 300–650 K. In order to characterize the phosphors, X-ray diffraction and photoluminescence (PL) techniques were used. The emission spectrum of air heated SrBPO5:Eu3?+ phosphor exhibited emission bands at 590, 614, 651 and 702 nm under 248 nm excitation, assigned to transitions of Eu3?+ ion. In phosphor prepared in reducing (Ar + 8% H2) atmosphere, a broad emission band due to Eu2?+ ranging from 350 to 400 nm was observed with 340 nm excitation. EPR studies have confirmed the presence of Eu2?+ ions in the samples prepared in reducing atmosphere. TSL glow curve of SrBPO5:Eu3?+ had shown intense peaks around 397, 510, 547 K and a weak peak around 440 K whereas in case of SrBPO5:Eu2?+ system, glow peaks at 414, 478 and weak peak at 516 nm were observed. The shift in TSL glow pattern can be attributed to stabilization of different oxidation states of the dopant ion in the host lattice. Apart from this, TSL trap parameters such as trap depth and frequency factor were determined. Spectral characteristics of TSL emission have shown that Eu3?+?/Eu2?+ ion acts as the luminescent centre in the respective phosphors. 相似文献
11.
《Advanced Powder Technology》2007,18(1):5-22
Cubic and/or monoclinic Y2O3:Eu3+ nanoparticles (10–50 nm) were made continuously without post-processing by single-step, flame spray pyrolysis (FSP). These particles were characterized by X-ray diffraction, nitrogen adsorption and transmission electron microscopy. Photoluminescence (PL) emission and time-resolved PL intensity decay were measured from these powders. The influence of particle size on PL was examined by annealing (at 700–1300°C for 10 h) as-prepared, initially monoclinic Y2O3:Eu3+ nanoparticles resulting in larger 0.025–1 μm, cubic Y2O3:Eu3+. The influence of europium (Eu3+) content (1–10 wt%) on sintering dynamics as well as optical properties of the resulting powders was investigated. Longer high-temperature particle residence time during FSP resulted in cubic nanoparticles with lower maximum PL intensity than measured by commercial micron-sized bulk Y2O3:Eu3+ phosphor powder. After annealing as-prepared 5 wt% Eu-doped Y2O3 particles at 900, 1100 and 1300°C for 10 h, the PL intensity increased as particle size increased and finally (at 1300°C) showed similar PL intensity as that of commercially available, bulk Y2O3:Eu3+ (5 μm particle size). Eu doping stabilized the monoclinic Y2O3 and shifted the monoclinic to cubic transition towards higher temperatures. 相似文献
12.
Nanocrystalline Eu3+-doped YAG powders were prepared by modified Pechini method. The structural properties were investigated with XRD, SEM and Raman spectroscopy. XRD pattern indicated that the phase-pure YAG:Eu3+ crystallites were obtained without the formation of any other phases. Raman spectrum revealed good homogeneity and crystallinity of synthesized nanopowders. The luminescent properties were studied by measurement of excitation and emission spectra, quantum yields and decay curves. The effect of Eu3+ concentration on 5D0 level lifetime was studied. The processes resulting in the relaxation of excited state (5D0 level) were discussed and the probabilities of radiative and nonradiative processes were calculated using the model of f–f transition intensities. It was found that the observed shortening of 5D0 level lifetime with Eu concentration is caused by increase of nonradiative process probability. 相似文献
13.
The novel Ca4?x(PO4)2O: xDy3+ and Ca4?x?y(PO4)2O: xDy3+, yEu2+ multi-color phosphors were synthesized by traditional solid-state reaction. The crystal structure, particle morphology, photoluminescence properties and energy transfer process were investigated in detail. The X-ray diffraction (XRD) results demonstrate that the products showed pure monoclinic phase of Ca4(PO4)2O when x < 0.1. The scanning electron microscopy (SEM) indicated that the phosphors were grain-like morphologies with diameters of ~ 3.7–7.0 μm. Under excitation of 345 nm, Dy3+-doped Ca4(PO4)2O phosphors showed multi-color emission bands at 410, 481 and 580 nm originated from oxygen vacancies and Dy3+. Interestingly, Ca4(PO4)2O: Dy3+, Eu2+ phosphors exhibited blue emission band at 481 nm and broad emission band from 530 to 670 nm covering green to red regions. The energy transfer process from Dy3+ to Eu2+ was observed for the co-doped samples, and the energy transfer efficiency reached to 60% when Eu2+ molar concentration was 8%. In particular, warm/cool/day white light with adjustable CCT (2800–6700 K) and high CRI (Ra > 85) can be obtained by changing the Eu2+ co-doping contents in Ca4(PO4)2O: Dy3+, Eu2+ phosphors. The optimized Ca3.952(PO4)2O: 0.04Dy3+, 0.008Eu2+ phosphor can achieve the typical white light with CCT of 4735 K and CRI of 87. 相似文献
14.
Min Zhu Chen Hu Jianhong Li Yuanquan Feng Huilin Kong Shakir Ullah Maofan Li Fei You Bing Teng Degao Zhong Jie Tang 《Journal of Materials Science: Materials in Electronics》2018,29(24):20607-20614
In this work, Gd(P0.5V0.5)O4: x at.% Eu3+ phosphors with different dopant concentrations (x?=?1, 3, 5, 6, 7, 9) were synthesized through chemical coprecipitation method. The phosphors were characterized by XRD, SEM, infrared spectroscopy, photoluminescence excitation, emission spectra and CIE. The results of XRD indicate that the obtained phosphors have the tetragonal phase structure. Eu3+ emission transitions arise mainly from the 5D0 level to the 7FJ (J?=?0, 1, 2, 3, 4) manifolds. The emission intensity and crystalline of Gd(P0.5V0.5)O4:x at% Eu3+ powders are increasing with annealing temperature at 600, 800, 1000, 1100, and 1200 °C, respectively. The introduction of VO43? can broaden the range of UV excitation spectrum wavelength and enhance the transition between 5D0 → 7F1 to 5D0 → 7F2 for long wavelength emission. And the most dominant emission peak of Eu3+ for 5D0 → 7F2 transition is closer to pure red light at 622 nm. The maximum emission intensity of the phosphors is the concentration of 6 at.% Eu3+ because of the distance of the neighbor Eu3+ ions reaching a certain critical value and the influence of multipolar interaction. Compared to commercial phosphors Y2O3:Eu3+ and (Y,Gd)BO3:Eu3+, our work yielded a longer wavelength red light emission intensity and a higher proportion of red light to orange light. All our results indicate that color purity of this phosphor turns it into a promising red phosphor in ultraviolet-pumped light-emitting diodes. 相似文献
15.
Molten salt synthesis,characterization, and luminescence of SrWO4, SrWO4:Tb3+ and SrWO4:Eu3+ powders
Xiaoyu Sun Xiaodan Sun Xingang Li Jian He Binsheng Wang 《Journal of Materials Science: Materials in Electronics》2014,25(5):2320-2324
SrWO4, SrWO4:Tb3+, and SrWO4:Eu3+ powders were synthesized by a method of molten salt. XRD patterns showed that the synthesized powders have a pure tetragonal scheelite structure without the presence of deleterious phases. Scanning electron microscopy images show that powders are in the range of 20–35 nm. The emission spectrum of SrWO4 shows the emission peak in the blue spectral region. The excitation spectra of SrWO4:Tb3+ and SrWO4:Eu3+ show the energy transfer from WO4 2? group to Tb3+ and Eu3+ ions with a high efficiency. The emission spectrum of SrWO4:Tb3+ shows the green emission at 545 nm corresponding to the 5D4 → 7F5 transition of Tb3+. The emission spectrum of SrWO4:Eu3+ shows the red emission located at 612 nm corresponding to the 5D0 → 7F2 transition of Eu3+. The asymmetry ratio of SrWO4:Eu3+ is found to be 5.54, which indicates that the Eu3+ ions are located in a lower symmetric site. 相似文献
16.
Pengfei Niu Xiaohua Liu Yiru Wang Weiren Zhao 《Journal of Materials Science: Materials in Electronics》2018,29(1):124-129
Ba2LaV3O11:Eu3+ phosphors were firstly synthesized by the traditional solid-state reaction method at 1100 °C. Their luminescence properties were investigated by photoluminescence excitation and emission spectra. The excitation spectrum shows a broad band centered at about 275 nm in the region from 200 to 370 nm, which is attributed to an overlap of the charge transfer transitions of O2??→?V5+ and O2??→?Eu3+. The phosphors exhibit the red emissions of Eu3+ and the emission intensity ratio of 5D0?→?7F2 to 5D0?→?7F1 is dependent on the Eu3+ concentration due to an environment change about Eu3+ ions. Concentration quenching occurs at 30 mol% in the phosphors and exchange interaction is its main mechanism. Ba2LaV3O11:Eu3+ displays tunable CIE color coordinates from yellow orange to red depended on Eu3+ content, which may have a potential application for illuminating and display devices. 相似文献
17.
Congbing Tan Yunxin Liu Wenbin LiYutao Zhang Yunan Han 《Materials Science and Engineering: B》2011,176(16):1251-1256
Lanthanide-doped uniform pure cubic phase Y2O3 hollow microspheres have been successfully synthesized via a facile, high yield urea-based coprecipitation route with assistant of carbon spheres templates. The diameter and shell thickness of the microspheres can be manipulated by adjusting carbon sphere templates. Under a 980 nm excitation, Yb3+/Er3+, Er3+, Yb3+/Tm3+-doped Y2O3 hollow microspheres emit bright upconversion red, green, blue light with high purity, respectively, while Eu3+, Eu3+/Tb3+-doped Y2O3 hollow microspheres exhibit intense downconversion red light under the excitation of 254 nm ultraviolet light. Especially, the 610 nm emission intensity of Eu3+ in the Eu3+/Tb3+-codoped Y2O3 hollow microspheres is almost 5 times of that in the Y2O3:Eu3+ hollow microspheres indicating the occurring of the energy transfer from Tb3+ to Eu3+ ions. 相似文献
18.
Dan Li Jinxian Wang Xiangting Dong Wensheng Yu Guixia Liu 《Journal of Materials Science》2013,48(17):5930-5937
Polyvinyl pyrrolidone (PVP)–PVP/[Y(NO3)3 + Eu(NO3)3] core–sheath composite nanofibers were prepared by coaxial electrospinning, and then Y2O3:Eu3+ hollow nanofibers were synthesized by calcination of the as-prepared composite nanofibers. For the first time, YF3:Eu3+ hollow nanofibers were successfully fabricated by fluorination of the Y2O3:Eu3+ hollow nanofibers via a double-crucible method using NH4HF2 as fluorinating agent. The morphology and properties of the products were investigated in detail by X-ray diffraction, scanning electron microscope (SEM), transmission electron microscope (TEM), and fluorescence spectrometer. YF3:Eu3+ hollow nanofibers were pure orthorhombic phase with space group Pnma and were hollow-centered structure with the mean diameter of 211 ± 29 nm. Fluorescence emission peaks of Eu3+ in the YF3:Eu3+ hollow nanofibers were observed and assigned to the energy levels transitions of 5D0 → 7F1 (587 and 593 nm), 5D0 → 7F2 (615 and 620 nm), and the 5D0 → 7F1 hypersensitive transition at 593 nm was the dominant emission peak. Moreover, the emitting colors of YF3:Eu3+ hollow nanofibers were located in the red region in CIE chromaticity coordinates diagram. The luminescent intensity of YF3:Eu3+ hollow nanofibers was increased remarkably with the increasing doping concentration of Eu3+ ions and reached a maximum at 7 mol% of Eu3+. This preparation technique could be applied to prepare other rare earth fluoride hollow nanofibers. 相似文献
19.
We have prepared cubic boron nitride samples doped with europium and codoped with europium and chromium. Their red photoluminescence is due to Eu3+ and Eu3+-Cr3+ electronic transitions involving Eu3+ in a noncentrosymmetric position in a field of cubic symmetry. Chromium is shown to have a positive effect on the incorporation of Eu3+ into lattice sites of c-BN. The photoluminescence spectrum of polycrystalline c-BN codoped with Eu3+ and Cr3+ is a combination of the spectra of Eu3+ in fields of cubic and monoclinic symmetries, the latter spectrum being blue-shifted relative to the spectrum of Eu3+-doped microcrystalline powder. The c-BN materials prepared in this study can be used as red phosphors and light emitters possessing high thermal stability, radiation hardness, and chemical resistance. 相似文献
20.
Rongfang Wang Xingming Wei Ronghuan Qin Pingfang Tao Liqin Qin Haichuang Liang 《Journal of Materials Science》2017,52(12):6994-6998
High-quality ZnSe:Eu, Mn quantum dots (QDs) with white light emitting were synthesized via a green preparation method in an aqueous solution using thioglycolic acid as a stabilizing agent. The composition of the QDs could be flexibly controlled by varying the amount of Eu or Mn cation. The effects of reflux time and Eu2+ ion dopant concentration on the luminescence properties were systematically investigated. The obtained QDs were characterized by photoluminescence spectrometry, X-ray powder diffraction, and high-resolution transmission electron microscopy. The proposed method formed cubic ZnSe:Mn2+, Eu2+ QDs with the maximum emission peak at 460 and 580 nm. In the optimal condition, the quantum yields of ZnSe:Mn2+, Eu2+ QDs could reach 27.68%. The CIE color coordinates were (0.328, 0.334), which agreed with those of pure white light (0.33, 0.33). The results verified that the ZnSe:Mn2+, Eu2+ QDs exhibited potential in light-emitting diode applications. 相似文献