The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut

Weijie Guo, Nan Chen, Hao Lu, Changwen Su, Yue Lin, Guolong Chen, Yijun Lu, Li Li Zheng, Zhangbao Peng, Hao-Chung Kuo, Chih Hao Lin, Tingzhu Wu*, Zhong Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Color gamut is of the paramount importance in the display. Light-current-voltage (L-I-V) characteristics of red, green, and blue flip-chip mini-light-emitting diodes (LEDs) (100 μm × 200 μm) are investigated at temperatures similar to the operational temperatures. Both the ideality factor and the temperature dependence of external quantum efficiency (EQE) suggest that the nonradiative loss in red mini-LED is higher. We also illustrate the intensive lateral luminous intensity fluctuation for red mini-LED under the over-driving current by capturing the spatial emission mapping. The influence of temperature and driving current on the chromaticity coordinates of mini-LEDs is determined. Furthermore, we propose a drive-current algorithm to maximize the color gamut of the trichromatic mixed light at different temperatures. The results indicate that, for the application of self-emitting mini-LED displays, the maximum color gamut is more sensitive to green emission, whereas enhancing the radiative recombination in red mini-LED could contribute a lot to the improvement on net performance.

Original languageEnglish
Article number8681719
Pages (from-to)2263-2268
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number5
StatePublished - 1 May 2019


  • Displays
  • color gamut
  • mini-light-emitting diode (LEDs)

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