Xie Bin, Cheng Yanhua, Hao Junjie, Shu Weicheng, Wang Kai, Luo Xiaobing
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Sci Rep. 2017 Nov 30;7(1):16663. doi: 10.1038/s41598-017-16966-2.
Quantum dots (QDs)-based white light-emitting diodes (QDs-WLEDs) have been attracting numerous attentions in lighting and flat panel display applications, by virtue of their high luminous efficacy and excellent color rendering ability. However, QDs' key optical parameters including scattering, absorption and anisotropy coefficients for optical modeling are still unclear, which are severely against the design and optimization of QDs-WLEDs. In this work, we proposed a new precise optical modeling approach towards QDs. Optical properties of QDs-polymer film were obtained for the first time, by combining double integrating sphere (DIS) system measurement with inverse adding doubling (IAD) algorithm calculation. The measured results show that the typical scattering, absorption and anisotropy coefficients of red emissive QDs are 2.9382 mm, 3.7000 mm and 0.4918 for blue light, respectively, and 1.2490 mm, 0.6062 mm and 0.5038 for red light, respectively. A Monte-Carlo ray-tracing model was set-up for validation. With a maximum deviation of 1.16%, the simulated values quantitatively agree with the experimental results. Therefore, our approach provides an effective way for optical properties measurement and precise optical modeling of QDs for QDs-WLEDs.
基于量子点（QDs）的白光发光二极管（QDs-WLEDs）凭借其高发光效率和出色的显色能力，在照明和平板显示应用中吸引了众多关注。然而，用于光学建模的量子点关键光学参数，包括散射、吸收和各向异性系数仍不明确，这严重阻碍了QDs-WLEDs的设计与优化。在这项工作中，我们提出了一种针对量子点的新的精确光学建模方法。通过将双积分球（DIS）系统测量与反向倍增（IAD）算法计算相结合，首次获得了量子点-聚合物薄膜的光学性质。测量结果表明，红色发射量子点对于蓝光的典型散射、吸收和各向异性系数分别为2.9382毫米、3.7000毫米和0.4918，对于红光分别为1.2490毫米、0.6062毫米和0.5038。建立了蒙特卡罗光线追踪模型进行验证。模拟值与实验结果在最大偏差为1.16%的情况下定量吻合。因此，我们的方法为QDs-WLEDs中量子点的光学性质测量和精确光学建模提供了一种有效途径。
