Resonant-enhanced full-color emission of quantum-dot-based micro LED display technology

Hau Vei Han, Huang Yu Lin, Chien-Chung Lin, Wing Cheung Chong, Jie Ru Li, Kuo Ju Chen, Peichen Yu, Teng-Ming Chen, Huang-Ming Chen, Kei May Lau, Hao-Chung Kuo

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

Colloidal quantum dots which can emit red, green, and blue colors are incorporated with a micro-LED array to demonstrate a feasible choice for future display technology. The pitch of the micro-LED array is 40μm, which is sufficient for high-resolution screen applications. The method that was used to spray the quantum dots in such tight space is called Aerosol Jet technology which uses atomizer and gas flow control to obtain uniform and controlled narrow spots. The ultra-violet LEDs are used in the array to excite the red, green and blue quantum dots on the top surface. To increase the utilization of the UV photons, a layer of distributed Bragg reflector was laid down on the device to reflect most of the leaked UV photons back to the quantum dot layers. With this mechanism, the enhanced luminous flux is 194% (blue), 173% (green) and 183% (red) more than that of the samples without the reflector. The luminous efficacy of radiation (LER) was measured under various currents and a value of 165 lm/Watt was recorded.

Original languageEnglish
Pages (from-to)32504-32515
Number of pages12
JournalOptics Express
Volume23
Issue number25
DOIs
StatePublished - 14 Dec 2015

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