Unraveling the Origin of Low Optical Efficiency for Quantum Dot White Light-Emitting Diodes From the Perspective of Aggregation-Induced Scattering Effect
Unraveling the Origin of Low Optical Efficiency for Quantum Dot White Light-Emitting Diodes From the Perspective of Aggregation-Induced Scattering Effect
复制标题
从聚集诱导散射效应揭示量子点白光发光二极管光效率低的根源
DOI：
10.1109/ted.2021.3060698
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发表时间：
2021-04
影响因子：
3.1
通讯作者：
Li J.-S.
中科院分区：
文献类型：
--
作者：
Li Z.-T.;Li J.-X.;Deng Z.-H.;Liang J.-Y.;Li J.-S.
量子点是一种具有广泛应用前景的光电材料。然而，QD白色发光二极管（QD-白色-LED）的效率不处于期望的水平，特别是当硅酮基质中的QD浓度高并且相应的机制尚未完全阐明时。在这项研究中，我们从实验和理论上研究了硅中量子点的聚集诱导散射（AIS）效应，并揭示了量子点白光LED器件效率低的根源。采用三维时域有限差分法和光线追迹法建立了量子点的AIS模型。结果表明，AIS效应是更强的更高的QD浓度，并导致更大的有效聚集体尺寸（EAS），这是通过比较与QD-硅薄膜的实验结果证实。此外，我们发现，AIS效应会导致显着降低在量子点白光LED的辐射效率时，EAS超过50个粒子，这是由制造的设备进行验证。根据光谱能量分析，量子点白光LED的低效率可以归因于在高量子点浓度下强烈的AIS效应，导致严重的后向散射和再吸收损耗。这项研究也是重要的非破坏性测试的聚集程度所表现出的量子点在有机硅矩阵和精确建模的量子点白光LED。
Quantum dots (QDs) are promising materials for various optoelectronic applications. However, the efficiency of QD white light-emitting diodes (QD-white-LEDs) is not at the desired level, particularly when the QD concentration in the silicone matrix is high and the corresponding mechanism has not been fully elucidated. In this study, we experimentally and theoretically investigated the aggregation-induced scattering (AIS) effect of QDs in silicone and unraveled the origin of low efficiency for QD-white-LED devices. Three-dimensional finite-difference time domain and ray tracing simulations were carried out to establish the AIS model for QDs. Results indicate that the AIS effect is stronger for higher QD concentrations and leads to a larger effective aggregate size (EAS), which was confirmed by comparing with the experimental results of QD-silicone films. Furthermore, we found that the AIS effect causes a significant reduction in the radiant efficiencies of QD-white-LEDs when the EAS exceeds 50 particles, which is validated by fabricated devices. According to the spectral energy analysis, the low efficiency of QD-white-LEDs can be attributed to a strong AIS effect at high QD concentrations, causing severe backscattering and reabsorption loss. This study is also important for nondestructive testing the degree of aggregation demonstrated by QDs in a silicone matrix and for precisely modeling QD-white-LEDs.
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影响因子：
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作者：
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