Micro-LEDs are one of the most promising candidates for next-generation displays,yet they are inconvenienced by the efficiency reduction induced by the sidewall defects when pursuing further scaled-down device dimensi...Micro-LEDs are one of the most promising candidates for next-generation displays,yet they are inconvenienced by the efficiency reduction induced by the sidewall defects when pursuing further scaled-down device dimensions.We have systematically investigated both the size and temporal dependence of micro-LEDs.Micro-LED arrays with a mesa size ranging from 7 to 100μm were prepared for display purposes.The luminance and external quantum efficiency(EQE)were measured and discussed.Surprisingly,micro-LED arrays with a smaller mesa size exhibit a higher EQE under 100 ns pulse duration operation when compared with longer pulse duration operations.Under certain short-pulsed excitation,a 7×7μm^(2)micro-LED array even exhibits a>20%higher EQE as compared to the direct current(DC)or the long duration pulse operation condition.We thus concluded that the notorious efficiency reduction induced by sidewall defects in small-sized micro-LED arrays could be significantly reduced by applying short-pulse voltages.展开更多
基金Fujian Provincial Projects(2021HZ0114,2021J01583,2021L3004)Fujian Science Technology Innovation Laboratory for Optoelectronic Information of China(2020ZZ110,2021ZZ122)National Key Research and Development Program of China(2021YFB3600104)。
文摘Micro-LEDs are one of the most promising candidates for next-generation displays,yet they are inconvenienced by the efficiency reduction induced by the sidewall defects when pursuing further scaled-down device dimensions.We have systematically investigated both the size and temporal dependence of micro-LEDs.Micro-LED arrays with a mesa size ranging from 7 to 100μm were prepared for display purposes.The luminance and external quantum efficiency(EQE)were measured and discussed.Surprisingly,micro-LED arrays with a smaller mesa size exhibit a higher EQE under 100 ns pulse duration operation when compared with longer pulse duration operations.Under certain short-pulsed excitation,a 7×7μm^(2)micro-LED array even exhibits a>20%higher EQE as compared to the direct current(DC)or the long duration pulse operation condition.We thus concluded that the notorious efficiency reduction induced by sidewall defects in small-sized micro-LED arrays could be significantly reduced by applying short-pulse voltages.
