Enhanced Stability of All‐Inorganic Perovskite Light‐Emitting Diodes by a Facile Liquid Annealing Strategy

Abstract

Ensuring the stability of all‐inorganic halide perovskite light‐emitting diodes (LEDs) has become an obstacle that needs to be broken for commercial applications. Currently, lead halide perovskite CsPbX3 (X = Br, I, Cl) nanocrystals (NCs) are considered as alternative materials for future fluorescent lighting devices due to their combination of superior optical and electronic properties. However, the temperature of the surface of the LEDs will increase after long‐term power‐on work, which greatly affects the optical stability of CsPbX3 NCs. In order to overcome this bottleneck issue, a strategy of annealing perovskite materials in liquid is proposed, and the changes in photoluminescence and electroluminescence (EL) behaviors before and after annealing are studied. The results show that the luminescence stability of the annealed perovskite materials is significantly improved. Moreover, the EL stability of different perovskite LED devices under long‐term operation is monitored, and the performance of the annealed materials is particularly outstanding. The results have proved that this convenient and low‐cost liquid annealing strategy is suitable for large‐scale postprocessing of perovskite materials, granting them stable fluorescence emission, which will bring a new dawn to the commercialization of next‐generation optoelectronic devices.

Color tunable of Ln-MOFs (Ln = Tb, Eu) and excellent stability for white light-emitting diode

“…The LED fabrication process was similar to that reported in our previous work. 31 First, the prepared MOF powders were mixed with epoxy resin (1 : 8) and deposited on a 365 nm UV-LED chip. Subsequently, the devices were processed at 100 °C for 1 h. Finally, a series of multi-color LEDs were obtained for subsequent measurements.…”

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

“…In addition, it is worth noticing that all-inorganic single junction devices offer interesting potential applications in high impact optoelectronics. Examples include photodetectors for gamma and X-rays detection, [107][108][109][110][111] scintillators, [112][113][114][115] photocatalysts, [116][117][118][119] and light emitting devices, [120][121][122][123] offering a plethora of new attractive solutions.…”

Organic‐Inorganic Hybrid Low‐dimensional Lead Iodides with Broadband Yellow to Red Light Emissions

“…[1][2][3][4][5] Especially, traditional CsPbX 3 perovskites display outstanding photoluminescence (PL) performances with various advantages of adjustable composition and band gaps, tunable emission wavelength covering the entire visible spectra, narrow bandwidth, high photoluminescence quantum yield (PLQY) as well as facile syntheses processes. [6][7][8][9][10] At the same time, 3D perovskites can be tailored into manifold 2D layers, 1D chains and 0D clusters containing various connecting manners of corner-, edge-and face-sharing between octahedral [PbX 6 ] units. By using organic cations to replace Cs + , a large amount of organic-inorganic hybrid lead halide perovskites have been explored extensively as luminescent materials.…”