Abstract:

Traffic surveillance complement lighting source has severe glare effect, which causes potential safety problems by disturbing driver’s vision. Taking into consideration of the eye sensitivity to light at different wavelengths, it is possible to reduce the glare effect by increasing the relatively insensitive red part in the spectral distribution of light source. This requires changing the phosphor components in the lighting devices. In this work, cerium-doped yttrium aluminum/gallium garnet and europium-doped calcium/strontium aluminum silicon nitride phosphors are synthesized by high temperature solid state reaction method. All the samples have pure phases, and the powder particles are evenly distributed. Spectroscopic measurements reveal that phosphors can be effectively excited by visible blue light and emit green-yellow and red light, respectively. They are fabricated together with blue chips to make lighting devices. The red-light phosphor contributes to improved lighting quality, such as the color temperature and color rendering index. Meanwhile, the yellow-green light part is reduced while the white-light emission is maintained, which could effectively solve the glare problem.

Key words: safety, powders, optimization, phosphor, glare

摘要：

交通监控补光源在工作时产生的强烈眩光会干扰驾驶员视线，从而给道路安全带来了隐患。考虑到人眼对于不同色光的敏感程度，通过改进补光源的光谱分布，提高人眼较不敏感的红光部分，能够有效地减轻眩光。这需要改变发光器件中的荧光粉组成。本文通过高温固相反应法制备了铈掺杂的钇铝镓石榴石基黄绿色荧光粉以及铕掺杂的钙锶铝硅氮化物红色荧光粉。所合成样品均为纯相，粉末颗粒分布均匀。光谱测试表明，样品能够被可见蓝光有效激发，发射光分别位于黄绿光区和红光区。将上述荧光粉与蓝光芯片复合封装得到发光器件。测试表明，红色荧光粉能够显著改善发光器件的色温、显色指数等照明品质，在保持白光的同时能够减少光谱中的黄绿光部分，从而缓解眩光效应。

关键词: 安全, 粉体, 优化, 荧光粉, 眩光