Efficient and Stable Perovskite White Light‐Emitting Diodes for Backlit Display

Abstract

High-quality backlit display puts forward urgent demand for colorconverting materials. Recently, metal halide perovskites (MHPs) with full spectral tunability, high photoluminescence quantum yields (PLQYs), and high color purity have found potential application in wide-color-gamut display. Regrettably, naked MHPs suffer from long-term instable issue and cannot pass harsh stability tests. Herein, amorphous-glass-protected green/ red CsPbX 3 quantum dots (QDs) are prepared by elaborately optimizing glass structure, perovskite concentration, and in situ crystallization. PLQYs of green CsPbBr 3 @glass and red CsPbBr 1.5 I 1.5 @glass reach 94% and 78%, respectively, which are the highest ones of CsPbX 3 @glass composites reported so far and comparable to colloidal counterparts. Benefited from complete isolation of QDs from external environment by glass network, CsPbX 3 @glass can endure harsh commercial standard aging tests of 85 °C/85%RH and blue-light-irradiation, which are applied to construct white light-emitting diodes (wLEDs) with high external quantum efficiency of 13.8% and ultra-high luminance of 500 000 cd m −2 . Accordingly, the perovskite wLED arrays-based backlit unit and a prototype display device are designed for the first time, showing more vivid and wide-color-gamut feature benefited from narrowband emissions of CsPbX 3 QDs. This work highlights practical application of CsPbX 3 @glass composite as an efficient and stable light color converter in backlit display.

Eu2+:CsCaX3 (X = Cl, Br, I) perovskite nanocrystals in glasses for blue light-emitting applications

“…These advantages of glasses have been nicely demonstrated by cesium lead halide PNC doped glasses. [32][33][34][35] Consequently, it is expected that stabilities of CsCaX 3 PNCs can also be improved by incorporating these nanocrystals in glass matrices. Since the precipitation of nanocrystals in glasses is strongly affected by the composition and structure of glass, alumino-borate glasses with high concentrations of calcium and halogen are designed.…”

CsPbX3 nanocrystals embedded in hollow AlO(OH) nanosheet assemblies towards highly bright flexible multicolor emitting films

“…The perovskite NCs have become an outstanding candidate for light-emitting diodes (LEDs), photodetectors, solar cells, and lasers. [12][13][14][15] However, the ionic crystalline properties of CsPbX 3 NCs make their environmental stability worrisome. CsPbX 3 NCs are not stable in polar solvents, resulting in decreased PL intensity and even a changed crystal structure.…”

Color-Tunable Light-Emitting Diodes Based on Rare Earth Doped Gallium Oxide Films

“…Artificial lighting has become ubiquitous and indispensable in modern society. Recently, there has been extensive research on color-tunable light-emitting diodes (LEDs) for applications in augmented and virtual reality displays, indoor lighting, and architectural lighting. − While organic LEDs offer numerous benefits compared to alternative lighting and display technologies, they are susceptible to water damage, exhibit a relatively high cost, and pose challenges in fabrication processes . On the other hand, quantum dot LEDs are extensively used owing to their notable characteristics, including excellent thermal and mechanical stability and tunable emission spectra .…”