Luminous Properties of Red, Green, and Blue Micro-LEDs and the Impacts on Color Gamut
Changdong Tong, Guangyao Li, Xi Zheng, Canbin Chen, Zhijie Ke, Rongxing Wu, Tingzhu Wu, Yijun Lü, Zhong Chen, Jianbang Zhuang, Weijie Guo
Abstract
Electrical-chromatic characteristics of red, green, and blue micro-LEDs ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$10\times 10\,\,\mu \text{m}$ </tex-math></inline-formula> ) are investigated at temperatures ranging from 300 to 340 K. The external quantum efficiency (EQE) of red micro-LEDs decreases significantly with the increasement in temperature, suggesting that heat dissipation is crucial for red micro-LEDs. The impacts of temperature and driving current on the chromaticity coordinates of the light emission from micro-LEDs are determined. When the trichromatic micro-LEDs are driven by the currents corresponding to the maximum EQE, the influence of temperature on the color gamut is limited, facilitating the achievement of high color gamut and high efficiency.