Color‐Tunable Up‐Conversion Emission and Infrared Photoluminescence and Dielectric Relaxation of Er3+/Yb3+ Co‐Doped Bi2Ti2O7 Pyrochlore Thin Films

The color‐tunable up‐conversion (UC) emission and infrared photoluminescence and dielectric relaxation of Er³⁺/Yb³⁺ co‐doped Bi₂Ti₂O₇ pyrochlore thin films prepared by a chemical solution deposition method have been investigated. The pyrochlore phase structure of Bi₂Ti₂O₇ can be stabilized by Er³⁺/Yb³⁺ co‐doping. Intense color‐tunable UC emission and infrared photoluminescence can be detected on the thin films excited by a 980 nm diode laser. Two UC emission bands centered at 548 and 660 nm in the spectra can be assigned to ²H_11/2, ⁴S_3/2 → ⁴I_15/2 and ⁴F_9/2 → ⁴I_15/2 transitions of Er³⁺ ions, respectively. A Stokes infrared emission centered at 1530 nm is due to ⁴I_13/2 → ⁴I_15/2 transition of Er³⁺ ions. The dependence of UC emission intensity on pumping power indicates that the UC emission of the thin films is a two‐photon process. The thin films also exhibit a relatively high dielectric constant and a low dissipation factor as well as a good bias voltage stability. Temperature‐ and frequency‐dependent dielectric relaxation has been confirmed. This study suggests that Er³⁺/Yb³⁺ co‐doped Bi₂Ti₂O₇ thin films can be applied to new multifunctional photoluminescence dielectric thin‐film devices.     

Color tunable up-conversion emission of ZrO2:Yb3+, Er3+ thin films prepared by chemical solution deposition

The color-tunable up-conversion (UC) emission was observed in ZrO₂:Yb³⁺, Er³⁺ thin films synthesized on fused silica substrates using a chemical solution deposition method. The crystal structure, surface morphology image and optical transmittance of ZrO₂:Yb³⁺, Er³⁺ thin films were detected in the matter of Yb³⁺/Er³⁺ doping content. Under excitation by 980?nm infrared light, intense UC emission can be obtained from ZrO₂:Yb³⁺, Er³⁺ thin films. Photoluminescence study shows that there are two emission bands centered at 548?nm and 660?nm in the UC luminescence spectra, which can be owing to (²H_11/2,⁴S_3/2)→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 transitions of Er³⁺ ions, respectively. In addition, the color coordinate of UC emission between green-red can be tuned by properly adjusting the dopant concentration, because the composition of Yb³⁺/Er³⁺ affect the red/green ratio via the process of cross relaxation and energy back transfer. Our study suggests that ZrO₂:Yb³⁺, Er³⁺ thin films can be considered as promising materials for new photoluminescence devices.     

SELECTIVE REMOVAL OF CESIUM FROM HIGHLY CONCENTRATED SODIUM NITRATE NEUTRAL SOLUTIONS BY POTASSIUM NICKEL HEXACYANOFERRATE(II)-LOADED SILICA GELS

ABSTRACT

Potassium nickel hexacyanoferrate(II) (KNiFC)-loaded silica gels were prepared by successive impregnation of macro pores with Ni(NO₃)₂, and K₄Fe(CN)₆ solutions. The KNiFC precipitates uniformly dispersed in the matrix of silica gel, and the loading percentage of KNiFC increased with the number impregnation cycles. The uptake of Cs⁺ on KNiFC-loaded silica gels (SLFC) attained equilibrium within 2 d, and relatively large distribution coefficients of Cs⁺, K_d,cs, above 10⁴ cm³/g, were obtained even in the presence of 5 M NaNO₃. The ion exchange of K⁺ Cs⁺ in SLFC followed a Langmuir-type isotherm and the maximum uptake amount of Cs⁺ was estimated to be 0.305 mmol/g. The breakthrough curve of Cs⁺ through a column packed with SLFC exhibited a favorable S-shaped profile. This exchanger proved to be effective for the selective removal of radioactive cesium from neutral waste solutions containing highly concentrated NaNO₃.     

Synthesis,Structure, and Thermally Stable Luminescence of Dy3+‐Doped Na3YSi2O7 Host Compound

Dy³⁺‐activated Na₃YSi₂O₇ phosphors have been prepared via a solid‐state reaction technique and may be used as a component of white light‐emitting diodes. X‐ray diffraction analysis demonstrates the single‐phase formation and the substitution of activator ions for Na₃YSi₂O₇:Dy³⁺ materials. The emission of Dy³⁺ in different Y³⁺ lattice sites exhibits blue (⁴F_9/2→⁶H_15/2) and yellow (⁴F_9/2→⁶H_13/2) lights, which function together to generate white light. The optimum doping concentration is 3 mol% and energy transfer between Dy³⁺ ions has been validated to be a resonant type via an electric dipole–dipole mechanism. The temperature‐dependent luminescent properties from 25°C to 400°C are studied, and the blue emission increases as a function of the temperature. This interesting phenomenon is proposed to be the result of the model in the configurational coordination diagram. The present investigation reveals the potential application for Na₃YSi₂O₇:Dy³⁺ system in solid‐state lighting.     

Cross Relaxation of Sm3+ and Energy Transfer Between Sm3+ and Eu3+ Ions in (Ca0.97Sr0.03)3(VO4)2 Phosphor Host

An attempt was made to verify that the inhibition of Sm³⁺→Eu³⁺ energy transfer in (Ca_0.97Sr_0.03)_2.82(VO₄)₂:Sm³⁺,0.12Eu³⁺ phosphors at Sm³⁺ content levels of >0.06 mol can be ascribed to the cross‐relaxation effect. The emission peak at around 951 nm attributed to the ⁶F_11/2→⁶H_5/2 transition of Sm³⁺, which should be barely detectable according to the energy‐gap law, was observed in this work by exciting the ⁴K_11/2 state of Sm^3 + . The results indicate that cross‐relaxation channels, which can depopulate the ⁴F_3/2 state of Sm³⁺, such as 1st Sm³⁺ (⁴F_3/2) + 2nd Sm³⁺ (⁶H_5/2)→1st Sm³⁺ (⁶F_11/2) + 2nd Sm³⁺ (⁶F_5/2) and 1st Sm³⁺ (⁴F_3/2) + 2nd Sm³⁺ (⁶H_5/2)→1st Sm³⁺ (⁶F_5/2) + 2nd Sm³⁺ (⁶F_11/2), may form and become efficient at an Sm³⁺ doping level of ≧0.06 mol. It was found that the 951‐nm emission suffered from concentration quenching, which resulted from a dipole–dipole multipolar interaction.     

Degradation of 2,4-dichlorophenol in aqueous solution by sono-Fenton method

This study presents the results of the Sono-Fenton process for the degradation of 2,4-dichlorophenol (DCP). The influential parameters such as H₂O₂, Fe²⁺ and pH for the Sono-Fenton process were investigated. Sono-Fenton method was found to be the best one for degradation efficiency of DCP when compared with that of the Fenton process. The optimum concentrations for the degradation of DCP using conventional Fenton’s method were found to be 20 mg/L of Fe²⁺ and 580 mg/L of H₂O₂ at pH 2.5. In the case of Sono-Fenton, the optimal concentrations were found to be 10 mg/L of Fe²⁺ and 400 mg/L of H₂O₂ at pH 2.5. Sono-Fenton method resulted in the reduction of required Fe²⁺ concentration (50%) and H₂O₂ concentration (31%). In addition, this method could be applicable even at pH 5.0 and a degradation efficiency of DCP was 77.6%. Kinetic studies for the degradation of DCP proved that the degradation of DCP tends to follow pseudo first order reaction and the rate constant was found to be 7 × 10⁻⁴ min⁻¹.     

Electrochemical oxidation of tannery wastewater

Tannery wastewater was treated by an electrochemical oxidation method using Ti/Pt, Ti/PbO₂ and Ti/MnO₂ anodes and a Ti cathode in a two‐electrode stirred batch reactor. The changes in colour concentration, chemical oxygen demand (COD), ammonia (NH₄⁺), sulfide and total chromium have been determined as a function of treatment time and applied current density. Gas chromatography–mass spectrometry (GC–MS) analysis, performed on the wastewater samples before and after treatment, as well as on foam samples, is reported. Anode efficiency, rate constants and energy consumption were estimated and discussed. The efficiency of Ti/Pt was 0.802 kgCOD h^?1 A^?1m^?2 and 0.270 kgNH₄⁺ h^?1 A^?1m^?2, and the energy consumption was 5.77 kWh kg^?1 COD and 16.63 kWh kg^?1 of NH₄⁺. The order of efficiency of anodes was found to be Ti/Pt ? Ti/PbO₂ > Ti/MnO₂. The results indicate that the electro‐oxidation method could be used for effective oxidation of tannery wastewater and a final effluent with substantially reduced pollution load can be obtained. © 2001 Society of Chemical Industry     

Effect of neodymium ions on upconversion fluorescence studies of oxyfluorosilicate glasses for optoelectronic devices

Effect of Nd₂O₃ concentrations on optical properties and upconversion studies were investigated for oxyfluorosilicate glasses with composition of SiO₂-Al₂O₃-Na₂CO₃-SrF₂-CaF₂. The Judd-Ofelt (JO) intensity parameters, Ω_λ (λ = 2, 4 and 6) as well as radiative properties for the ⁴F_3/2 level of Nd³⁺ ion have been evaluated from the absorption spectra of 1.0 mol% Nd₂O₃-doped glass. For all the glass samples, the strong NIR emissions were observed at 891, 1058 and 1330 nm and have been attributed to ⁴F_3/2 → ⁴I_{9/2, 11/2, 13/2} transitions respectively. The stimulated emission cross-section for the ⁴F_3/2 → ⁴I_11/2 transition is evaluated and found to be 4.24 × 10^–20 cm². From the decay curves, experimental lifetimes (τ_exp) of the ⁴F_3/2 level have been determined and are found to be 363, 340, 205, 134, 122 and 54 μs for 0.1, 0.5, 1.0, 1.5, 2.0 and 3.0 mol% Nd³⁺ ions doped glasses, respectively. By exciting the prepared glass samples at 808 nm, the upconversion of infrared light into blue, green, yellow and red emission have also observed. These results indicate that the present glasses could be useful for opto-electric devices and solid state laser applications.     

Electrochemical reduction of sulphur in dimethylacetamide

The electrochemical reduction of sulphur into S^2?₈ and S^?₃, then into S^2?₄ has been studied in dimethylacetamide in order to prove that neither the disproportionation of S^2?₈, nor the direct electroreduction of S^2?₈ could be neglected to explain the mechanism of the electroreduction of S₈. A good fit between calculated and experimental visible absorbance or electrochemical curves recorded during coulometric experiments could be obtained without introducing the S^?₄ radical proposed in the literature.Equilibrium constants have been determined

.An estimation of the basicity of S^2?₈ and S^2?₃ ions is deduced from voltammetric curves recorded during the electrolysis of S₈ solutions.     

Steady-state isotopic transient kinetic analysis of steam reforming of methanol over Cu-based catalysts

Mechanistic aspects of steam reforming of methanol were studied via steady-state isotopic transient kinetic analysis over three copper-based catalysts, namely combustion-synthesized Cu-Ce-O and Cu-Mn-O, and commercial Cu-ZnO-Al₂O₃. The “C-path” and “O-path” for the production of CO₂ via steam reforming of methanol was analysed with the following step changes in the feed: ¹²CH₃OH/H₂O/Ar/He → ¹³CH₃OH/H₂O/He and CH₃OH/H₂¹⁶O/Ar/He → CH₃OH/H₂¹⁶O/H₂¹⁸O/He. The presence of CH₃¹⁸OH in the products after the switch to ¹⁸O-labeled water indicates that a major path of the reaction is the one involving a methyl formate intermediate. This appears to be the main path over the Cu-Mn-O catalyst, while parallel paths via dioxomethylene and methyl formate intermediates appear to be operative over Cu-Ce-O and Cu-ZnO-Al₂O₃ catalysts.     

Low-temperature catalytic combustion on Pt/SO 4 2− /ZrO2 and Pd/SO 4 2− /ZrO2 catalysts

Low-temperature combustion of various organic compounds on Pt/SO ₄ ^–2 /ZrO₂ and Pd/SO ₄ ^–2 /ZrO₂ was studied. For these organic compounds, especially saturated hydrocarbons, the combustion activities of Pt/SO ₄ ^–2 /ZrO₂ are higher than those of Pt/ Al₂O₃. Pt/SO ₄ ^–2 /ZrO₂ combustion catalysts can be used in a wide range of space velocity and oxygen content. The catalytic activity is enhanced with an increase of Pt loading from 0.1 to 1.0 wt%. The superacidity of the support material is responsible for the improvement in activity rather than an increase in catalyst surface area or metal dispersion. Pd/SO ₄ ^–2 /ZrO₂ are less active than Pt/SO ₄ ^–2 /ZrO₂.     

Applicability of the Brønsted Relation to Reactions of the Hydrated Electron

The hydrated electron, e^?_aq, reacts with Brønsted acids, BH⁺, to yield H atoms through a process of proton transfer For a series of Brønsted acids of charge types 1+, 0 and 1?, the rate constant, k, is related to the acid dissociation constant K according to k/p = GA(qK/p)^α, where α = 0.42. Some acids give rate constants deviating from this relation. These are shown to be ambident reagents with e^?_aq, one pathway obeying the Brønsted relation, while the other may be nucleophilic addition of e^?_aq to a reaction center in B. Thus —k(e^?_aq), the rate of disappearance of e^?_aq may be greater than +k(H), the rate of formation of H atoms. To account for the results, a molecular model for the structure of e^?_aq forming a hydrated anion is favored. Its reaction with H⁺_aq is discussed, accounting for recent observations on the rate of the reaction e^?_aq + H⁺_aq → H_aq, which in our view corresponds to proton transfer to fully ordered hydrated electrons, rather than electron addition to H⁺_aq.     

Visible green upconversion luminescence of Er3+/Yb3+/Li+ co-doped CaWO4 particles

The upconversion (UC) luminescence of Li⁺/Er³⁺/Yb³⁺ co-doped CaWO₄ phosphors is investigated in detail. Single crystallized CaWO₄:Li⁺/Er³⁺/Yb³⁺ phosphor can be obtained, co-doped up to 25.0/5.0/20.0 mol% (Li⁺/Er³⁺/Yb³⁺) by solid-state reaction. Under 980 nm excitation, CaWO₄:Li⁺/Er³⁺/Yb³⁺ phosphor exhibited strong green UC emissions visible to the naked eye at 530 and 550 nm induced by the intra-4f transitions of Er³⁺ (²H_11/2,⁴S_3/2→⁴I_15/2). The optimum doping concentrations of Yb³⁺/Li⁺ for the highest UC luminescence were verified to be 10/15 mol%, and a possible UC mechanism that depends on the pumping power is discussed in detail.     

Energy transfer and controllable colors of upconversion emission in Er3+ and Dy3+ co-doped CaF2 transparent ceramics

x at. % Er³⁺, 3 at. % Dy³⁺: CaF₂ transparent ceramics (x=1-5) with good transparency were fabricated by hot-pressed sintering. The phase composition of nanoparticles and transparent ceramics, microstructure, in-line transmittance, upconversion spectra and lifetime of transparent ceramics, as well as energy transfer mechanism between Er³⁺ and Dy³⁺ were investigated. The mean grain sizes of nanoparticles decreased from 33.0 nm to 26.2 nm with the Er³⁺ doping concentration increasing from 1 to 5 at.%. The microstructure of ceramic samples presented nearly dense microstructure and EDS analysis indicated Er³⁺ and Dy³⁺ were uniformly incorporated into CaF₂ lattice. Under 900 nm excitation, the emission intensity for ⁴F_9/2→⁶H_15/2 transition of Dy³⁺ decreased and for ⁴S_3/2→⁴I_15/2 transition of Er³⁺ increased, the lifetime for the ⁴F_9/2 level of Dy³⁺ decreased while the ⁴F_7/2 level of Er³⁺ increased with the raise of Er³⁺ doping concentration. The energy transfer mechanism was proved to be the dipole-dipole interaction. The upconversion luminescence color was tuned from orange through yellow to green by changing the Er³⁺/Dy³⁺ ratio. In addition, the Vickers hardness, fracture toughness, and the thermal conductivity of Er³⁺, Dy³⁺: CaF₂ transparent ceramics were discussed. All the results showed the Dy³⁺ could be used as a sensitizer for Er³⁺: CaF₂ transparent ceramic in the upconversion field.     

Synthesis and characterization of polypyrrole/graphitic carbon nitride/niobium pentoxide nanocomposite for high-performance energy storage applications

Graphitic carbon nitride (GCN) has been employed as a supercapacitor electrode because of its high carbon-to-nitrogen ratio and flexible structure. However, its low surface area and poor conductivity continue to be obstacles for practical usage. GCN's electrochemical characteristics are enhanced by the hybrid structure it forms with polypyrrole and Nb₂O₅. The synthesized polypyrrole (Ppy)/GCN/niobium pentoxide (Nb₂O₅) (Ppy/GCN/Nb₂O₅) nanocomposite electrode was tested for supercapacitance by cyclic voltammetry (CV) and Alternating current impedance techniques in 6 M Potassium hydroxide(KOH) electrolyte. The Ppy/GCN/Nb₂O₅ is linked to a network of agglomerated GCN and Nb₂O₅ nanoparticles with additional spherical shapes. The specific capacitance of Ppy/GCN/Nb₂O₅ was determined to be 1177 Fg⁻¹ at a current density of 5 Ag⁻¹. The Ppy/GCN/Nb₂O₅ electrode in KOH has average specific energy and specific power densities of 33 Wh kg⁻¹ and 2991 W kg⁻¹, respectively. The electrode showed excellent capacitance-retention ability of 97% after 10,000 cycles. The results demonstrate the high stability and efficient performance of the Ppy/GCN/Nb₂O₅ electrode employed in supercapacitors. The performance of the Ppy/GCN/Nb₂O₅ electrode was found to be superior to those reported for other carbon-based materials.     

PERTECHNETATE REMOVAL BY MACROPOROUS POLYMER IMPREGNATED WITH 2-NITROPHENYL OCTYL ETHER (NPOE)

ABSTRACT

The loading kinetics of TcO₄ ^? from water and 1?M NaOH solution to macroporous polymer (MPP) impregnated with 2-nitrophenyl octyl ether (NPOE) are reported. The loading process can be simply expressed as: -ln (1 - [TcO₄ ^?]_MPP / [TcO₄ ^?]_MPP,e) =k t +A, where [TcO₄ ^?]_MPP and [TcO₄ ^?]_MPP,e respectively refer to the pertechnetate concentration in the MPP phase at time t and the equilibrated value, and A is a constant. With TcO₄ ^? in water and in 1?M NaOH as loading solutions, the overall mass transfer coefficients k are estimated to be 0.058?min^?1 and 0.067?min^?1 and the saturated loading capacities of TcO₄ ^? are 8.0 × 10^?8?mol/g wet MPP and 5.6 × 10^?8?mol/g wet MPP, respectively. TcO₄ ^? can be easily stripped from loaded MPP by >1?M HNO₃ solution. Loading-stripping cycling and breakthrough experiments demonstrate a good performance of NPOE-impregnated MPP, in particular with TcO₄ ^?-containing water as the loading feed.     

Formation of Bromate and Chlorate during Ozonation and Electrolysis in Seawater for Ballast Water Treatment

Many effective technologies have been developed and approved for ballast water treatment, and the effectiveness of a process should be evaluated considering its environmental friendliness. The aim of this study was to evaluate the formation and formation mechanisms of bromate (BrO₃^?) and chlorate (ClO₃^?) in seawater during ozonation, electrolysis, and a combined (ozonation/electrolysis) process. In seawater ozonation, BrO₃^? was generated exceeding a 5 mg/L ozone dose despite the high Br^? (65 mg/L). The formation of BrO₃^? and ClO₃^? by electrolysis depended on the electrode materials where two types of electrodes (IrO₂/Ti and Pt/Ti) were used. The combined (ozonation/electrolysis) process generated much higher levels of BrO₃^? and ClO₃^? than either individual process. In ozonation or electrolysis, mixed oxidant including HOCl/OCl^? and HOBr/OBr^? is the main parameter for inactivation, which is called total residual oxidant, TRO. In this study, a predictive model for BrO₃^? and ClO₃^? was suggested in terms of TRO formation. This predictive model can recommend allowable TRO (generated by ozonation or electrolysis) for practical applications in seawater treatment.     

Polymer pendant ligand chemistry, 4. Recovery of precious metal ions from strongly acidic solution with a polymer-supported o-phenylenediamine hydrochloride ligand

We report on the synthesis and reactivity of a polymer-supported o-phenylenediamine hydrochloride ligand, PS-PDHC, using macroporous 6% crosslinked polystyrene-divinylbenzene beads. The PS-PDHC ligand was found to be highly selective to AuCl₄⁻ ions in strongly acidic solutions in the presence of other precious metal ions, PdCl₄²⁻, PtCl₄²⁻, RhCl₆³⁻, and RuCl₅²⁻ (selectivity values: 2.5, Au/Pd; 7.5, Au/Pt; 7, Au/Rh; 2.2, Au/Ru) as well as other transition metal ions, Fe ³⁺, Cr³⁺, CU²⁺, Nit+, and Mn²⁺. The sorption capacity, selectivity, kinetics of removal and recovery, and solution isotherms have been determined for AuCl₄⁻ ions in competition with the above-mentioned metal ions. The relative ease of formation of the anionic complex in 0.5 M HCI, AuCl₄⁻ was thought to be the primary reason for its selective ability to bind to the PS-PDHC ligand by an anion-exchange mechanism. Therefore, the effect of the HCI concentration on the kinetics of AuCl₄⁻ ion removal from solution was also investigated to clearly show that raising the pH from 0 to 5 caused a dramatic decrease in rate. The AuCl₄⁻ ion can be recovered quantitatively from the PS-PDHC beads using a 5% thiourea solution in 0.1 M HCl, allowing the polymer-supported ligand to be reused.     

Preparation and Characteristics of Ca2NaMg2V3O12:Sm3+ Single-Phased White-Emitting Phosphors

Novel single-phased phosphors Ca₂NaMg₂-V₃O₁₂:xSm³⁺ that exhibit efficient white-light photoluminescence properties have been successfully synthesized by the solid-state reaction method. The formation of a single Ca₂NaMg₂V₃O₁₂ phase has been confirmed by X-ray powder diffraction (XRD). The wavelength-tunable white light is realized by coupling of the broad emission band at 500 nm due to a V⁵⁺?O^2? charge-transfer state transition and the sharp emission peaks at 564, 616, 650 and 708 nm assigned to ⁴G_5/2→⁶H_J (J = 5/2, 7/2, 9/2, 11/2) transitions of the Sm³⁺ ion. The luminescence color can be tuned from green to white by adjusting the doping concentration of Sm³⁺. When the doping concentration of Sm³⁺is increased from x = 0 to x = 0.20, the color rendering index of the Ca₂NaMg₂V₃O₁₂:xSm³⁺ phosphors increased from 55 to 83. The present white phosphors show a great potential for white LEDs.     

Insights into structure,local site symmetry,and energy transfer for regulating luminescent properties of SrLaLiTeO6: Dy/Eu and its application in wLEDs

A series of spectrally tunable Dy³⁺/Eu³⁺-coactivated double perovskites SrLaLiTeO₆ (SLLT) were synthesized via solid-state ceramic route under air condition. Considering differences of ionic radius and valences among the dopants and host cations, Dy³⁺/Eu³⁺ are all inclined to enter La site, though slight occupations in Sr site cannot be completely ruled out. Dy shows narrow band emissions in blue (B) to yellow (Y) region, which is stemmed from magnetic (⁴F_9/2 → ⁶H_15/2) and electric (⁴F_9/2 → ⁶H_13/2) dipole transitions, respectively. Eu³⁺ exhibits orange-red (O–R) emissions, with two dominant peaks located at ∼ 593 and 617 nm from magnetic (⁵D₀ → ⁷F₁) and electric (⁵D₀ → ⁷F₂) dipole transitions, which could be used as compensation for the red-emitting portion in pc-wLEDs via energy transfer (ET) from Dy to Eu to overcome the disadvantage of low excitation efficiency. The substitutional local site symmetry could be regularly modified along with severely impacting on Y/B and R/O ratios for Dy and Eu emission colors via simply modifying the doping contents, due to changes in bond lengths and Coulomb potentials from interconnected octahedrons [LiO₆] and [TeO₆] around the dopants. The fabricated pc-wLED via combining a commercial n-UV LED chip with the SLLT: Dy/Eu, exhibited splendid EL performance, with the CIE coordinate is calculated to be (0.3690, 0.3539), CCT of 3232 K, and CRI (R_a) of 86.5. Altogether, it manifests that the stable SLLT: Eu and SLLT: Dy/Eu are potentially good candidates for applications as red and white phosphors, respectively in indoor plant growth LED and pc-wLEDs.