|
|||||
|
|
A potential red-emitting phosphor Ca_2YTaO_6:Eu~(3+):Luminescence properties,thermal stability and applications for white LEDs |
|
| Authors: | Ka Ding Siru A Shuo Pang Leyan Shan Yaqi Zhang Pengfei Sun Bin Deng Ruijin Yu |
| Affiliation: | 1. College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China;2. College of Innovation & Experiment, Northwest A&F University, Yangling 712100, China;3. College of Chemistry & Biology and Environmental Engineering, Xiangnan University, Chenzhou 423043, China;4. Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, Xiangnan University, Chenzhou 423043, China;5. Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering, China Three Gorges University, Yichang 443002, China |
| Abstract: | A novel red-emitting phosphor tantalate Ca2YTaO6:Eu3+ was synthesized by a solid-state reaction. The purity and surface morphology of the phosphors were characterized. The Ca2YTaO6:Eu3+ phosphors show a sharp emission peak at 612 nm under near-ultraviolet (n-UV) at 395 nm because of the 5D0 → 7F2 transition of Eu3+. The optimal Eu3+ doping concentration in Ca2YTaO6 is 40 mol% and the critical energy-transfer distance of Eu3+ ions was calculated to be 0.9 nm. The emission spectra of Ca2YTaO6:Eu3+ from 300 to 480 K were investigated. The thermal-quenching temperature (T0.5) of Ca2YTaO6:Eu3+ is above 480 K. The color purity of Ca2YTaO6:40 mol%Eu3+ is as high as 99.8%. The luminescence lifetime of Ca2YTaO6:40 mol%Eu3+ was also discussed. The high color purity and high thermal stability of Eu3+-doped Ca2YTaO6 phosphors contribute to its application value in white light-emitting diodes (w-LEDs). |
| Keywords: | Luminescence Tantalate Light-emitting diodes Rare earths |
| 本文献已被 CNKI ScienceDirect 等数据库收录！ | |