期刊
CERAMICS INTERNATIONAL
卷 47, 期 10, 页码 13769-13775出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.01.239
关键词
Cyan emitting phosphor; Site-selective excitation; White LEDs; Near-ultraviolet excited; Photoluminescence properties
资金
- Natural National Science Foundation of China (NSFC) [51702147, 51802138, 51902226]
- Projects for Outstanding Young Scientific Research Personnel Training Plan of Fujian College [2018MJK47]
- Scientific Start Foundation of Longyan University [LB2016001]
Bismuth ions are utilized as non-rare-earth activators for luminescent materials, showing intense n-UV absorption and cyan emission in the synthesized NaGd9(SiO4)6O2: xBi3+ phosphors. The optimal doping concentration of Bi3+ is found to be 0.02, with two luminescence centers at 462 and 558 nm.
Bismuth ions, as excellent non-rare-earth activators for luminescent materials, possess characteristic excitation in the near ultraviolet (n-UV) region rather than in the visible region and could avoid reabsorption as compared to traditional rare-earth (e.g., Eu2+, Ce3+) phosphors. In this work, a series of apatite-type NaGd9(SiO4)6O2: xBi3+ (NGSO) phosphors with a hexagonal crystal system were synthesized through high-temperature solid-solid reactions. They showed intense n-UV absorption and cyan emission of Bi3+ ions. The optimal Bi3+ doping concentration was 0.02. Further, there were two types of Bi3+ ions that provided seven- and nine-coordination in NGSO: xBi3+ phosphors, resulting in two luminescence centers at 462 and 558 nm, respectively. Bi3+ (I) ions were dominant for the emission at 558 nm excited at a wavelength of 340 nm, and Bi3+ (II) ions governed the luminescence at 462 nm excitation at 370 nm; energy transfer occurred from Bi3+ (I) to Bi3+ (II) ions. Finally, good thermal stability with activation energy (Ea) of 0.296 eV was demonstrated. These findings exhibit the potential application of NGSO: 0.02Bi3+ phosphors as cyan phosphors in n-UV white light-emitting diodes.
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