Self-polarized RGB device realized by semipolar micro-LEDs and perovskite-in-polymer films for backlight applications

Abstract

In backlighting systems for liquid crystal displays, conventional red, green, and blue (RGB) light sources that lack polarization properties can result in a significant optical loss of up to 50% when passing through a polarizer. To address this inefficiency and optimize energy utilization, this study presents a high-performance device designed for RGB polarized emissions. The device employs an array of semipolar blue μLEDs with inherent polarization capabilities, coupled with mechanically stretched films of green-emitting CsPbBr 3 nanorods and red-emitting CsPbI 3 -Cs 4 PbI 6 hybrid nanocrystals. The CsPbBr 3 nanorods in the polymer film offer intrinsic polarization emission, while the aligned-wire structures formed by the stable CsPbI 3 -Cs 4 PbI 6 hybrid nanocrystals contribute to substantial anisotropic emissions, due to their high dielectric constant. The resulting device achieved RGB polarization degrees of 0.26, 0.48, and 0.38, respectively, and exhibited a broad color gamut, reaching 137.2% of the NTSC standard and 102.5% of the Rec. 2020 standard. When compared to a device utilizing c-plane LEDs for excitation, the current approach increased the intensity of light transmitted through the polarizer by 73.6%. This novel fabrication approach for polarized devices containing RGB components holds considerable promise for advancing next-generation display technologies.

Advancing Long-Wavelength InGaN Micro-LEDs as Wavelength-Selective Detectors for White-Light Communication

“…InGaN-based microlight emitting diodes (μLEDs) have the potential to be used in novel display technologies owing to their advantages of high brightness, long lifetime, and high contrast. 1,2 In addition to display applications, visible light communication (VLC) technology based on μLEDs has attracted the attention of researchers. 3,4 Currently, VLC systems based on μLEDs operating as emitters have been widely reported with transmission rates up to more than 10 GHz.…”

“…InGaN-based microlight emitting diodes (μLEDs) have the potential to be used in novel display technologies owing to their advantages of high brightness, long lifetime, and high contrast. , In addition to display applications, visible light communication (VLC) technology based on μLEDs has attracted the attention of researchers. , Currently, VLC systems based on μLEDs operating as emitters have been widely reported with transmission rates up to more than 10 GHz. − However, relatively few studies have been conducted on the use of μLEDs as VLC photodetectors (PDs). Compared with the silicon (Si)-based PDs commonly used in VLC systems, InGaN-based PDs have attracted academic interest owing to their advantages of low noise and high sensitivity.…”