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

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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

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Publication details

The article was received on 17 Jul 2018, accepted on 07 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC03515F
Citation: J. Mater. Chem. C, 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C8TC03515F

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