Photonic Characterization and Modeling of Highly Efficient Color Conversion Layers With External Reflectors
Journal
IEEE Photonics Journal
Journal Volume
15
Journal Issue
4
Date Issued
2023-08-01
Author(s)
Lee, Guan Ying
Weng, Shao Yi
Ho, Wan Hua
Huang, Chun Wei
Chao, Han Yu
Huang, Sheng Kai
Kuo, Hao Chung
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.
Subjects
Display materials | fabrication and characterization | incoherent sources modeling | light emitting diodes | micro-optics | Quantum dot
SDGs
Type
journal article