Related Experiment Video
Updated: Nov 22, 2025
Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Site occupancy preference of Bi3+ and Bi3+-Eu3+ codoped yttrium galliate phosphors for white LEDs
Liang Zhang1, Langping Dong1, Yonghui Xu1
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China. hpyou@ciac.ac.cn and University of Science and Technology of China, Hefei 230026, P. R. China.
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.
