Issue 40, 2018

Zero-thermal-quenching and photoluminescence tuning with the assistance of carriers from defect cluster traps

Abstract

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 5D37FJ 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.

Graphical abstract: Zero-thermal-quenching and photoluminescence tuning with the assistance of carriers from defect cluster traps

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
17 7 2018
Accepted
07 8 2018
First published
09 8 2018

J. Mater. Chem. C, 2018,6, 10687-10692

Zero-thermal-quenching and photoluminescence tuning with the assistance of carriers from defect cluster traps

Y. Chen, B. Yu, J. Gou and S. F. Liu, J. Mater. Chem. C, 2018, 6, 10687 DOI: 10.1039/C8TC03515F

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