Issue 4, 2021

Site occupancy preference of Bi3+ and Bi3+–Eu3+ codoped yttrium galliate phosphors for white LEDs

Abstract

A variety of Bi3+-activated and Bi3+–Eu3+ codoped Y3GaO6 phosphor samples were obtained by solid-state reaction. The phase purity and crystal structure of the specimens were characterized via powder X-ray diffraction (XRD) analysis and Rietveld refinement. For the single Bi3+-doped Y3GaO6 phosphor, two different PL peaks at 410 and 595 nm were obtained, resulting from the two different Bi3+ sites occupied. The site occupation is driven by Bi3+ ion concentration. There is an energy transfer from the Bi3+ to Eu3+ ions in the YGO:Bi3+,Eu3+ phosphors. Besides, the energy transfer mechanism, efficiencies, quantum efficiency and thermal stability have been discussed in detail, demonstrating that the sample possesses high quantum efficiency and good thermal stability. The high color-rendering index Ra (92.9, and 81.6) and low CCT (3286 K, and 3904 K) of the white light-emitting diodes (WLEDs) clearly indicate that these samples are promising candidates for WLEDs.

Graphical abstract: Site occupancy preference of Bi3+ and Bi3+–Eu3+ codoped yttrium galliate phosphors for white LEDs

Supplementary files

Article information

Article type
Paper
Submitted
20 Nov 2020
Accepted
15 Dec 2020
First published
16 Dec 2020

Dalton Trans., 2021,50, 1366-1373

Site occupancy preference of Bi3+ and Bi3+–Eu3+ codoped yttrium galliate phosphors for white LEDs

L. Zhang, L. Dong, Y. Xu, S. Yin and H. You, Dalton Trans., 2021, 50, 1366 DOI: 10.1039/D0DT03983G

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