Tunable emission properties of tri-doped Ca9LiY2/3(PO4)7:Ce3+,Tb3+, Mn2+phosphors with warm white emitting based on energy transfer

• 作者: Jindi Wang Riyan Su Min Cui Mengmeng Shang
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 504-511
• 页数: 8页
• 语种: 英文

摘要

Tri-doped Ca9LiY2/3(PO4)7:Ce3+,Tb3+,Mn2+ phosphors were prepared by a high-temperature solid state method. Under UV light excitation, Ca9LiY2/3(PO4)7:Ce3+samples exhibit a broad band ranging from 320 to 500 nm. At 77 K, the emission spectra of Ca9LiY2/3(PO4)7:Ce3+samples present two obvious emission peaks, indicating that Ce3+ions occupy two different kinds of lattice sites (Ca(1/2) and Ca(3)). As a good sensitizer for Tb3+, Ce3+ions in Ca9LiY2/3(PO4)7 lattice can effectively transfer part of energy to Tb3+, and the energy transfer mechanism is determined to be dipole-dipole interaction. Consequently, the emitting color for Ce3+ and Tb3+ co-doped Ca9LiY2/3(PO4)7 samples can be tuned from bluish violet to green. In order to further enlarge the emission gamut, Mn2+ ions as red emission components were added, forming tri-doped single-phase Ca9LiY2/3(PO4)7:Ce3+,Tb3+,Mn2+ phosphors. The Ca9LiY2/3(PO4)7:Ce3+,Tb3+,Mn2+ phosphors exhibit tunable emission properties through controlling the relative doping concentration of Ce3+, Tb3+and Mn2+. Especially, Ca9LiY2/3(PO4)7:0.09Ce3+,0.12 Tb3+, 0.30Mn2+can emit warm white light. The sample shows good thermal stability. At 150 ℃, the emission intensity for Ce3+(360 nm), Tb3+ (545 nm) and Mn2+ (655 nm) decreases to 63％, 69％, and 72％ of its initial intensity, respectively. Moreover, the sample obtains good stability after 10 cycles between room temperature and 150 ℃.