Brightened Bicomponent Perovskite Nanocomposite Based on Förster Resonance Energy Transfer for Micro‐LED Displays

Abstract

Lead halide perovskite quantum dots (PQDs) are making their way toward next-generation display applications, such as serving as color conversion layers in micro-light-emitting-diode (micro-LED) arrays. Red PQDs containing iodine exhibit weaker brightness compared with their green counterpart when employed as color conversion layers. Therefore, PQDs with enhanced brightness are highly favorable for micro/mini-LED displays. A universal strategy of bicomponent perovskite nanocomposite (BPNC) with significantly enhanced photoluminescence (PL) intensity is proposed through the built-in Förster resonance energy transfer (FRET) from the core CsPbBr 3 to the shell 𝜸-CsPbI 3 , and it is confirmed that it is through a pair of combined quasi-degenerate energy levels in the blue spectra region that the FRET is conducted, resulting in a high excitation wavelength selectivity. Owing to the highly efficient energy transition route from blue excitation to red emission established by the FRET, the BPNC exhibits the 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 wavelengths. The BPNCs in a blue micro-LED array are employed as color downconversion layers, and excellent color conversion properties and high color gamut are demonstrated. This strategy of BPNC paves a road to the full-color micro-LED displays.

High-Performance Fluorescent Microspheres Based on Fluorescence Resonance Energy Transfer Mode for Lateral Flow Immunoassays

“…Fluorescence lifetime is a common tool utilized to further confirm the occurrence of FRET . As illustrated in Figure G, the fluorescence lifetime of the donor (TCBPEME) decreased from 4.53 to 0.65 ns.…”

“…Fluorescence lifetime is a common tool utilized to further confirm the occurrence of FRET. 31 As illustrated in Figure 3G, the fluorescence lifetime of the donor (TCBPEME) decreased from 4.53 to 0.65 ns. Meanwhile, the fluorescence lifetime of the acceptor (BAPF) gradually increased from 3.26 to 4.28 ns (Figure 3H) with increasing concentrations of TCBPEME and reached a plateau at 30 mg/mL (Figure S9).…”

Recent Advances and Perspectives of Metal Halide Perovskite Heteronanocrystals

“…Recently, CsPbBr 3 @γ-CsPbI 3 core–shell PNCs were successfully fabricated by growing an SiO 2 insertion layer to suppress the halide migration. The SiO 2 layer impedes the formation of the type-I heterojunction between the CsPbBr 3 core and CsPbI 3 shell; however, this unique structure allows near-field energy transfer from the core to the shell, leading to enhanced radiative recombination and overall light-conversion efficiency to meet the requirement of phosphor converted micro-LEDs (Figure j) . The PNCs were also explored to encapsulate with an upconversion material.…”

A Photoinitiator-Grafted Photoresist for Direct In Situ Lithography of Perovskite Quantum Dots

“…Colloidal quantum dots (QDs) have emerged as an excellent engineering material for next generation optoelectronic and photonic devices due to their fascinating color persistence, exceptional color purity, and excellent photoluminescence quantum yield (PLQY). − In particular, QDs have evolved as powerful light-emitting materials in various displays including light-emitting diode (LED), − color converted OLED, and Micro-LED. − Recently, there has been increasing interest in the utilization of QDs in next-generation displays such as augmented reality glasses, which provide contents that is both vivid and realistic . To integrate QDs into these realistic displays, the QD layer should be uniformly patterned into red-green-blue (RGB) full-color pixel arrays on a scale of a few microns or less .…”