Novel red-emitting perovskite-type phosphor CaLa1鈭?/sub>xMgM鈥睴6: xEu3+ (M鈥?#xa0;= Nb, Ta) for white LED application
- 作者：Jingshan Houa ; b ; Xin Yinb ; Yongzheng Fangc ; Fuqiang Huangb ; huangfq@mail.sic.ac.cn ; Weizhong Jianga ; jwzh@dhu.edu.cn
- 关键词：Phosphors ; Solid-state reaction ; Eu3+-doped ; Luminescence ; CaLaMgM&prime ; O6
- 刊名：Optical Materials
- 出版年：2012
- 期刊代码：81_09253467
- 类别：ch
- 出版时间：June, 2012
- 卷：34
- 期：8
- 页码：1394-1397
- 文件大小：756 K
摘要
Single phase of CaLa1鈭?/sub>xMgM鈥睴6: xEu3+ (M鈥?/em> = Nb, Ta; 0 < x 猢?#xA0;1) red phosphors was prepared by solid-state reaction method, and their structural and optical properties were also investigated in detail. The excitation spectra of CaLa1鈭?/sub>xMgM鈥睴6: xEu3+ revealed two excitation bands at 396 and 466 nm, which correspond to the sharp 7F0 鈫?#xA0;5L6 and 7F0 鈫?#xA0;5D2 transitions of Eu3+ and matches well with the two popular emissions from near-UV and blue light-emitting diode (LED) in solid-state lighting technology. The intensity of the red emission for Ca(La0.7Eu0.3)MgTaO6 and Ca(La0.6Eu0.4)MgNbO6 are respectively three and four times higher than that of (Y0.95Eu0.05)2O3 under near-UV light irradiation, while under blue light irradiation are 2 and 2.5 times respectively. The quantum efficiencies of the entitled phosphors excited under 396 and 466 nm are also investigated and compared with commercial phosphors Y2O3:Eu3+, Sr2Si5N8:Eu2+ and Y3A5G12:Ce3+. The chromaticity coordinates of Ca(La0.7Eu0.3)MgTaO6 and Ca(La0.6Eu0.4)MgNbO6 (x = 0.662, y = 0.338) are close to the standard of National Television Standard Committee (NTSC) values (x = 0.670, y = 0.330).