科研之友
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摘要
A novel red phosphor Zn6Ga8-xTiO20:xCr(3+) was prepared via a high temperature solid-state method. The as-prepared phosphors were examined by means of X-ray diffraction, X-ray fluorescence and transmission electron microscopy. The results showed that the synthesized phosphor had a single mixed spinel structure and Cr3+ could be effectively doped into the host Zn6Ga8TiO20 by occupation of octahedral sites. It was showed that the excitation spectrum was composed of four bands located at 281, 337, 420 and 555 nm, respectively. The band at 281 nm corresponded to the (4)A(2)-T-4(1) (4P) transition of Cr3+ and that at 337 nm originated from the charge transfer from 2p orbitals of O2- to the 4s4p orbital of Ga3+, while the bands at 420 and 555 nm were related to the transitions of (4)A(2)-T-4(1) and (4)A(2)-T-4(2g) of Cr3+ ions, respectively. The emission spectrum was composed of the zero-phonon lines corresponding to the E-2-(4)A(2) transition of Cr3+ (689 nm, R sharp line), the N-line (696 nm) of Cr3+ locating at distorted sites, and the phonon-side bands. Therefore, this phosphor can be used as a red phosphor material in white LED.
- 出版日期2018-1
- 单位浙江工业大学
