| Tian Hua,Song Jun,Lu Qi-fei,Wang Da-jian.Flux-adjusted phase transformation from Ca2SiO4 to Ca3Si2O7 with Eu2+ activator for white light emitting diodes[J].Optoelectronics Letters,2012,8(5):352-355 |
| Flux-adjusted phase transformation from Ca2SiO4 to Ca3Si2O7 with Eu2+ activator for white light emitting diodes |
| Author Name | Affiliation | | Tian Hua | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,
China | | Song Jun | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China | | Lu Qi-fei | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,
China | | Wang Da-jian | School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Tianjin Key Laboratory for Photoelectronic Materials and Devices, Tianjin University of Technology, Tianjin 300384,
China
Key Laboratory of Display Materials and Photoelectronic Devices, Ministry of Education, Tianjin University of Technology,
Tianjin 300384, China |
|
| Abstract: |
| Eu2+-activated reddish-orange-emitting Ca3Si2O7 phosphors were synthesized with the addition of NH4Cl flux. When the phosphors were synthesized in a nominal composition of (Ca0.99Eu0.01)3Si2O7 without flux addition, a Ca3Si2O7 phase responsible for reddish-orange emission was identified to coexist with an intermediate phase of a-Ca2SiO4 for green emission. With the addition of NH4Cl flux, a-Ca2SiO4 was suppressed while the pure phase Ca3Si2O7 was obtained as the flux content was 3 wt%. Through varying the amount of flux, the emission color of samples can be tuned
from green to reddish-orange, corresponding to the phase transformation from a-Ca2SiO4 to Ca3Si2O7. Through optimizing the doping concentration of Eu2+, the optimized photoluminescence (PL) properties for reddish-orange emission can be achieved, which makes this kind of phosphor
prospective in the applications of the phosphor-converted white light emitting diodes (PC-WLEDs). |
| Hits: 4357 |
| Download times: 650 |
| This work has been supported by the National Natural Science Foundation of China (Nos.50872091, 21076161 and 50802062), the Tianjin Municipal Science/Technology Commission (Nos.10SYSYJC28100 and 2006ZD30), and the Tianjin Municipal Higher Education Commission (No.20110304). |
| View Full Text Download reader |
|
|
|
