標題: | CaY2Si2S8:Ce3+: a novel green-emitting thiosilicate phosphor for white light-emitting diodes |
作者: | Lee, Szu-Ping Huang, Chien-Hao Chen, Teng-Ming 應用化學系 應用化學系分子科學碩博班 Department of Applied Chemistry Institute of Molecular science |
公開日期: | 14-Nov-2014 |
摘要: | A novel green-emitting Ce3+-doped CaY2Si2S8 thiosilicate phosphor was synthesized by using solid-state methods in a sealed silica ampoule. This compound could be excited over a broad range from UV to blue light (400-450 nm) and generated a broadband emission peaking at similar to 495 nm, with a quantum efficiency of similar to 57%, which is promising for solid-state lighting applications. Temperature-dependent optical measurements of CaY2Si2S8:Ce3+ from 25 to 225 degrees C were performed. In addition, a white LED device was fabricated by using the green-emitting CaY2Si2S8:Ce3+ phosphor and commercially-available red-emitting CaAlSiN3:Eu2+ pumped with a 450 nm blue chip. The CRI value and CCT were measured to be 91-95 and 3800-8600 K, respectively, showing promising potential for solid-state lighting applications. The preparation, spectroscopic characterization, quantum efficiency, decay lifetime, thermal stability, and related LED device data are also presented. |
URI: | http://dx.doi.org/10.1039/c4tc01572j http://hdl.handle.net/11536/25313 |
ISSN: | 2050-7526 |
DOI: | 10.1039/c4tc01572j |
期刊: | JOURNAL OF MATERIALS CHEMISTRY C |
Volume: | 2 |
Issue: | 42 |
起始頁: | 8925 |
結束頁: | 8931 |
Appears in Collections: | Articles |