Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 40, Pages -Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc03515f
Keywords
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Funding
- National Key Research Program of China [2016YFA0202403]
- National Natural Science Foundation of China [21603140]
- Fundamental Research Funds for the Central Universities [GK201803036, GK201803029]
- 111 Project [B14041]
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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 D-5(3) energy level of Tb3+, compensating the inhibition on blue D-5(3) F-7(J) 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 degrees C benefited from the carriers captured by deeper traps. Thus, the reported Sr8ZnSc(PO4)(7):xTb(3+) phosphors may be candidates for high-power pc-WLEDs.
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