Wang Mei-Tan, Huang Jung-Min
Opt Express. 2015 May 4;23(9):11576-85. doi: 10.1364/OE.23.011576.
The chromaticity coordinates and spectra of phosphor-converted LEDs are demonstrated to be well controlled in this study. Through the feedback coating method of stacked yellow, green, and red phosphor layers, the color rendering index (CRI), correlated color temperature (CCT), and spectra are determined to match precisely the desired target. In addition, the reabsorption effect is strongly influenced by the order of stacked phosphor layers and the selected excitation wavelength of phosphors. The degree of reabsorption will modify the original spectra and cause a mismatch between the experimental measurement and the simulation based on the linear superposition of blue light and phosphor-emitted light. This feedback coating method offers an easy approach towards optimized spectra, which can offer the highest luminous efficacy of radiation with excellent color-rendering properties.
本研究表明，荧光粉转换型发光二极管的色度坐标和光谱能够得到很好的控制。通过堆叠黄色、绿色和红色荧光粉层的反馈涂覆方法，确定显色指数（CRI）、相关色温（CCT）和光谱能精确匹配所需目标。此外，再吸收效应受堆叠荧光粉层的顺序以及所选荧光粉激发波长的强烈影响。再吸收程度会改变原始光谱，并导致实验测量结果与基于蓝光和荧光粉发射光线性叠加的模拟结果之间出现不匹配。这种反馈涂覆方法为优化光谱提供了一种简便途径，可提供具有优异显色特性的最高辐射发光效率。
