title: A novel green-emitting phosphor Ba2Gd2Si4O13:Eu(2+) for near UV-pumped light-emitting diodes.
abstract: A novel green-emitting phosphor Ba2Gd2Si4O13:Eu(2+) has been prepared using a conventional high-temperature solid-state method. X-ray diffraction and photoluminescence spectra were used to characterize the as-synthesized phosphor. The Ba2Gd2Si4O13:Eu(2+) phosphor exhibits a broad emission band centered at 503 nm under 365 nm excitation. Monitoring the 503 nm emission, the Ba2Gd2Si4O13:Eu(2+) phosphor shows an intense broad excitation band ranging from 200 to 410 nm. The concentration quenching mechanism has been investigated, and demonstrated to involve a dipole-dipole interaction. The critical concentration was found to be about 4 mol%. The critical distance calculated using the concentration method and spectral overlap method was 23.9 Å and 27.1 Å, respectively. The temperature-dependent photoluminescence and CIE chromaticity coordinate of the Ba2Gd2Si4O13:Eu(2+) phosphor were also investigated in this work. The results revealed that Ba2Gd2Si4O13:Eu(2+) possesses excellent thermal stability and the CIE value of the Ba2Gd2Si4O13:0.04 Eu(2+) phosphor upon 365 nm excitation is (0.211, 0.434), located in the green region. All the properties indicate that the Ba2Gd2Si4O13:Eu(2+) phosphor is a potential green-emitting phosphor fit for ultraviolet light pumped LEDs.
authors.affiliation: Department of Applied Physics, School of Optoelectronic Information, Chongqing University of Technology, 69 Hongguang Street, Chongqing 400054, China. jinye@cqut.edu.cn.
authors.forename: Hongpeng
authors.initials: H
authors.lastname: Zhou
authors.forename: Qingping
authors.initials: Q
authors.lastname: Wang
authors.forename: Mingsong
authors.initials: M
authors.lastname: Jiang
authors.forename: Xingxing
authors.initials: X
authors.lastname: Jiang
authors.forename: Ye
authors.initials: Y
authors.lastname: Jin