1. Photonic Characterization and Modeling of Highly Efficient Color Conversion Layers With External Reflectors
- Author
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Guan-Ying Lee, Shao-Yi Weng, Wan-Hua Ho, Chun-Wei Huang, Han-Yu Chao, Sheng-Kai Huang, Hao-Chung Kuo, Chung-Chih Wu, and Chien-Chung Lin
- Subjects
Display materials ,fabrication and characterization ,incoherent sources modeling ,light emitting diodes ,micro-optics ,Quantum dot ,Applied optics. Photonics ,TA1501-1820 ,Optics. Light ,QC350-467 - Abstract
We propose a new method for fabricating arrays of colloidal quantum dots for color conversion layers (CCLs) with atomic layer deposited (ALD) encapsulation. Semiconductor processes were used to transfer the CCL onto a transparent glass substrate. This method enables pixels as small as 5 μm, and the pixel's size and pitch can be controlled through the semiconductor process and mask layout. A dual-color array with a red-and-green CCL was also demonstrated to be suitable for microdisplay applications in experiments. The best color conversion efficiency of a single color CCL reached as high as 20.7%. A set of distributed Bragg reflector mirrors was used to increase photon recycling, and these mirrors yielded an increase in peak intensity of 35.7%. We formulated a model of incoherent reflection and transmission to calculate the changes in CCL properties when mirrors are added; this model had close fit with results from experiments in which mirrors of different reflection coefficients were used. Through the use of ALD, the CCL can be stored at a normal room-temperature environment for more than 9000 hours, and the projected lifetime is linearly extrapolated to be 44,041 hours.
- Published
- 2023
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