Brightened Bicomponent Perovskite Nano-Composite Based on Förster Resonance Energy Transfer for Micro-LED Displays.

The lead halide perovskite quantum dots (PQDs) is making its way towards next-generation display applications, such as serving as color conversion layers (CCL) in micro-LED array. Red PQDs containing iodine exhibit weaker brightness compared with its green counterpart when it is employed as CCL. Therefore, PQDs with enhanced brightness is highly favorable for micro/mini-LED displays. We propose a universal strategy of bicomponent perovskite nano-composite (BPNC) with significantly enhanced PL intensity through the built-in Förster resonance energy transfer (FRET) from the core CsPbBr 3 to the shell γ-CsPbI 3 , and confirm that it is through a pair of combined quasi-degenerate energy levels at blue spectra region that the FRET is conducted, resulting in a high excitation wavelength selectivity. Owing to the high-efficient energy transition route from blue excitation to red emission established by the FRET, the BPNC exhibits brightest single-peak red photoluminescence with near 100% quantum yield. The BPNC with FRET is further proven to be adaptable to a wide range of emission wavelength. We employed the BPNCs in a blue micro-LED array as color down-conversion layers and demonstrate excellent color conversion properties and high color gamut. This strategy of BPNC paves a road to the full-color micro-LED displays. This article is protected by copyright. All rights reserved.