Issue 30, 2017

Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

Abstract

Thermal quenching is one of the most crucial challenges for photoluminescence and high-power applications, in which the phosphor suffers from emission loss due to non-radiative transitions with increasing temperature. Herein, we report new isostructural solid solution phosphors, Eu2+-doped KxCs1−xAlSi2O6 (0 ≤ x ≤ 0.6), with abnormal thermal quenching behavior, and their asymmetric emission spectra and decay curves for two emission centers verified the presence of two kinds of Eu2+ centers (Eu1 and Eu2) in the lattices. The maxima of both the Eu1 and Eu2 bands exhibit a blue-shift and the emission color was tuned from blue-green with color coordinates of (0.222, 0.324) to bright blue with color coordinates of (0.172, 0.132) upon 365 nm UV excitation as a function of x. These phosphors do not exhibit thermal quenching at high temperature, and this behavior is proposed to relate to the energy transfer from defect levels to the Eu2+ 5d band as also verified by thermoluminescence measurements, and the result demonstrated that the reported KxCs1−xAlSi2O6:Eu2+ phosphors may be candidates for blue-green components in UV-pumped high power white light emitting diodes (WLEDs).

Graphical abstract: Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

Article information

Article type
Paper
Submitted
08 jún 2017
Accepted
30 jún 2017
First published
03 júl 2017

J. Mater. Chem. C, 2017,5, 7489-7494

Thermally stable KxCs1−xAlSi2O6:Eu2+ phosphors and their photoluminescence tuning

M. Zhang, Z. Xia and Q. Liu, J. Mater. Chem. C, 2017, 5, 7489 DOI: 10.1039/C7TC02539D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements