Improved color purity of monolithic full color micro-LEDs using distributed bragg reflector and blue light absorption material

Shao Yu Chu, Hung Yu Wang, Ching Ting Lee, Hsin Ying Lee*, Kai Ling Laing, Wei Hung Kuo, Yen Hsiang Fang, Chien Chung Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this study, CdSe/ZnS core-shell quantum dots (QDs) with various dimensions were used as the color conversion materials. QDs with dimensions of 3 nm and 5 nm were excited by gallium nitride (GaN)-based blue micro-light-emitting diodes (micro-LEDs) with a size of 30 μm x 30 μm to respectively form the green and red lights. The hybrid Bragg reflector (HBR) with high reflectivity at the regions of the blue, green, and red lights was fabricated on the bottom side of the micro-LEDs to reflect the downward light. This could enhance the intensity of the green and red lights for the green and red QDs/micro-LEDs to 11% and 10%. The distributed Bragg reflector (DBR) was fabricated on the QDs color conversion layers to reflect the non-absorbed blue light that was not absorbed by the QDs, which could increase the probability of the QDs excited by the reflected blue light. The blue light absorption material was deposited on the DBR to absorb the blue light that escaped from the DBR, which could enhance the color purity of the resulting green and red QDs/micro-LEDs to 90.9% and 90.3%, respectively.

Original languageEnglish
Article number436
JournalCoatings
Volume10
Issue number5
DOIs
StatePublished - 1 May 2020

Keywords

  • Blue light absorption material
  • Color conversion layer
  • Distributed bragg reflector
  • Hybrid bragg reflector
  • Micro-light-emitting diodes
  • Quantum dots

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