Red-shift of vanadate band-gap by cation substitution for application in phosphor-converted white light-emitting diodes
Red-shift of vanadate band-gap by cation substitution for application in phosphor-converted white light-emitting diodes
复制标题
阳离子取代导致钒酸盐带隙红移在荧光粉转换白光发光二极管中的应用
DOI：
10.1063/1.4875926
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发表时间：
2014
影响因子：
4
通讯作者：
Yin Min
中科院分区：
文献类型：
--
作者：
Wei XianTao;Wen Jun;Li Shuo;Huang Shan;Cheng Jun;Chen YongHu;Duan ChangKui;Yin Min
Eu 3+掺杂的YVO 4是一种优良的传统红色荧光粉，但将其有效激发带向更长的波长移动是白色发光二极管应用的必要条件，也是一个需要很好解决的挑战。在观察到阳离子取代通常是控制荧光粉带隙的有效方法之后，我们对纯的和Bi 3+掺杂的LnVO 4（Ln = Y，Lu和Sc）的带隙进行了从头计算。结果表明，随着阳离子半径的增大，带隙逐渐减小，Bi ~（3+）的掺杂使带隙进一步减小。Eu ~（3+）掺杂和Eu ~（3+），Bi ~（3+）共掺杂的LnVO_4（Ln = Y，Lu，Sc）荧光粉的实验结果证实了这一点。特别是Eu 3+和Bi 3+共掺杂的ScVO 4，其激发波长向400 nm方向移动，满足了近紫外白色发光二极管的激发要求，是一种很有前途的白色发光红色荧光粉。
Eu3+ doped YVO4 is excellent traditional red phosphor, but shifting its efficient excitation band to a longer wavelength is necessary for application in white light-emitting diodes, and is a big challenge that calls for good solution. Following the observation that cation substitution usually is an effective way to manipulate the band-gap of phosphors, we carried out ab initio calculation for the band-gap of pure and Bi3+ doped LnVO4 (Ln = Y, Lu, and Sc). The results show that the band-gap decreases with the cationic radius from Y3+ to Sc3+, and the doping of Bi3+ further decreases their band-gaps. The experimental results on the Eu3+ doped and Eu3+, Bi3+ co-doped LnVO4 (Ln = Y, Lu, and Sc) phosphors confirm this. In particular, the excitation of Eu3+ and Bi3+ co-doped ScVO4 is shifted to approach 400 nm, which fulfills the excitation requirement of near-ultraviolet-based white light-emitting diodes, and implies that Eu3+ and Bi3+ co-doped ScVO4 should be a promising candidate as red phosphor in white lig...