Perovskite-based blue LED successfully developed; future lighting will be more affordable and environmentally friendly
Recently, researchers at Linköping University in Sweden have developed high-efficiency blue LED based on halide perovskites. The researchers stated that the new LED could lead to more affordable and energy-saving lighting.
The study has been published in Nature Communications.
LEDs made from halide perovskites could be a cheaper and more Environmental protection alternative for lighting and LED displays. Perovskites are a class of semiconductor materials defined by a cubic crystal structure. They have good light-emitting properties and are easy to manufacture. Using elements from the halogen group, namely fluorine, chlorine, bromine, and iodine, perovskites can be endowed with properties dependent on the crystal's chemical composition.
Green and red LEDs have already been fabricated using perovskite, but the development of blue LEDs remains challenging, making it impossible to produce white light for illumination.
Researchers at Linköping University in Sweden, in collaboration with scientists from China, Germany, the UK, and Denmark, have successfully produced halide perovskites that emit stable light in the 451–490 nm wavelength range, corresponding to colors ranging from deep blue to sky blue.
Researchers at Linköping University state that halide perovskite-based blue LEDs are both efficient and stable across a wide spectrum, describing them as "the most efficient blue perovskite LED to date."
However, researchers point out that the current work is fundamental research, and there is still a long way to go before practical applications can be realized in the future.
It is reported that there is further news regarding the manufacture of blue LED using perovskite:
Last March, scientists from the University of California, Berkeley (UC Berkeley) fabricated blue LED using a novel halide perovskite semiconductor material. The results demonstrated a technological breakthrough in applying unstable halide perovskites, which are primarily unstable because they change with temperature, humidity, and chemical environment, thereby degrading their optical and electronic properties. UC Berkeley scientists employed a new technique and components such as cesium, lead, and bromine to produce perovskite crystals that emit blue light.
去年10月， 来自清华大学等单位的研究人员通过使用Cl-配体替代Br-配体制备了具有优化的Cl分布的合金FAPbBr3-xClxNC薄膜。FAPbBr3-xClxNC薄膜显示出富含Cl的表面和9 nm蓝移发射光谱，实现了蓝色EL发射，最大亮度为2810 cd/m2，EQE为3.1％。这些发现为解决基于钙钛矿的蓝色LED光谱不稳定性提供另一种策略，并有利于PeLED的进一步发展。
Source: Qianzhan.com