Research on Luminance Uniformity of Green Micro-LED via Microscopic Hyperspectral System

The surface luminance uniformity factor (
${U}\text {)}$
of green Micro-LEDs with three different physical sizes detected by the microscopic hyperspectral imaging system was fully investigated. The luminance distribution characteristics and current-crowding effects of green Micro-LED chips were quantitatively studied, and the correlation between the luminance distribution uniformity and the physical size, electrical current, and temperature of green Micro-LEDs were also analyzed, providing a clear direction for improving the device reliability and increasing the external quantum efficiency (EQE) of green Micro-LED chips. Finally, the arrays composed of a certain number of green Micro-LEDs with three different physical sizes were tested to explore the relationship between the luminance uniformity factor (
${U}_{\text {A}}\text {)}$
and the physical size of Micro-LED with different driving voltages (
${V}\text {)}$
.