Photonic Characterization and Modeling of Highly Efficient Color Conversion Layers With External Reflectors

Guan Ying Lee, Shao Yi Weng, Wan Hua Ho, Chun Wei Huang, Han Yu Chao, Sheng Kai Huang, Hao Chung Kuo, Chung Chih Wu, Chien-Chung Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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.

Original languageEnglish
Article number2201110
JournalIEEE Photonics Journal
Issue number4
StatePublished - 1 Aug 2023


  • Display materials
  • fabrication and characterization
  • incoherent sources modeling
  • light emitting diodes
  • micro-optics
  • Quantum dot


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