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Zero-thermal-quenching and photoluminescence tuning with the assistance of carriers from defect cluster traps†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-08-09 00:00:00 , DOI: 10.1039/c8tc03515f Yali Chen 1, 2, 3, 4, 5 , Binxun Yu 1, 2, 3, 4, 5 , Jing Gou 1, 2, 3, 4, 5 , Shengzhong Frank Liu 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-08-09 00:00:00 , DOI: 10.1039/c8tc03515f Yali Chen 1, 2, 3, 4, 5 , Binxun Yu 1, 2, 3, 4, 5 , Jing Gou 1, 2, 3, 4, 5 , Shengzhong Frank Liu 1, 2, 3, 4, 5
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Thermal quenching is a serious limiting factor for high-power phosphor-converted white-light-emitting diodes (pc-WLEDs) due to the temperature increase that results in emission loss by non-radiative transitions. Herein, we report new Tb3+-doped Sr8ZnSc(PO4)7 phosphors with zero-thermal-quenching and tunable photoluminescence behaviors. As verified by thermoluminescence (TL) spectra, the carriers captured by shallow traps were transferred to 5D3 energy level of Tb3+, compensating the inhibition on blue 5D3 → 7FJ emissions from the increasing concentration (x) of Tb3+; therefore, the emission color was tuned from bright blue (0.205, 0.186) to white (0.215, 0.273) and finally to bright green (0.245, 0.411) upon 370 nm UV excitation as a function of x. In addition, the zero-thermal-quenching behavior at high temperatures up to 225 °C benefited from the carriers captured by deeper traps. Thus, the reported Sr8ZnSc(PO4)7:xTb3+ phosphors may be candidates for high-power pc-WLEDs.
中文翻译：
借助缺陷簇陷阱的载流子，实现零热猝灭和光致发光调谐†
热淬灭是大功率磷光转换白光发光二极管（pc-WLED）的严重限制因素，因为温度升高会导致非辐射跃迁导致发射损耗。在本文中，我们报告了新型的Tb 3+掺杂的Sr 8 ZnSc（PO 4）7荧光粉，具有零热猝灭和可调节的光致发光行为。如通过热致发光（TL）光谱所证实的，浅陷阱捕获的载流子被转移到Tb 3+的5 D 3能级，从而补偿了对蓝色5 D 3 → 7 F J的抑制作用。Tb 3+浓度（x）的增大导致排放; 因此，在370 nm UV激发下，发射颜色从x的亮蓝色（0.205，0.186）调整为白色（0.215，0.273），最后变为亮绿色（0.245，0.411）。此外，在更深的陷阱中捕获的载流子使高达225°C的高温下的零热猝灭行为受益。因此，报道的Sr 8 ZnSc（PO 4）7：x Tb 3+荧光粉可能是高功率pc-WLED的候选材料。
更新日期：2018-08-09
中文翻译：
借助缺陷簇陷阱的载流子，实现零热猝灭和光致发光调谐†
热淬灭是大功率磷光转换白光发光二极管（pc-WLED）的严重限制因素，因为温度升高会导致非辐射跃迁导致发射损耗。在本文中，我们报告了新型的Tb 3+掺杂的Sr 8 ZnSc（PO 4）7荧光粉，具有零热猝灭和可调节的光致发光行为。如通过热致发光（TL）光谱所证实的，浅陷阱捕获的载流子被转移到Tb 3+的5 D 3能级，从而补偿了对蓝色5 D 3 → 7 F J的抑制作用。Tb 3+浓度（x）的增大导致排放; 因此，在370 nm UV激发下，发射颜色从x的亮蓝色（0.205，0.186）调整为白色（0.215，0.273），最后变为亮绿色（0.245，0.411）。此外，在更深的陷阱中捕获的载流子使高达225°C的高温下的零热猝灭行为受益。因此，报道的Sr 8 ZnSc（PO 4）7：x Tb 3+荧光粉可能是高功率pc-WLED的候选材料。
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