Luminescent quantum dots (LQDs), which possess high photoluminescence quantum yield (QY), flexible emission color controlling and solution processibility, are promising in healthy lighting (warm white light without UV and infrared irradiation) and high quality displays. However, the present QDs are usually prepared at high temperature and tedious surface treating is needed to improve both optical properties and stability. This results in high costs, one of the most serious problems for the commercialization of LQDs.
Haibo Zeng and colleagues, Nanjing University of Science and Technology, China, developed a room-temperature supersaturated recrystallization method to rapidly synthesize highly luminescent all-inorganic halide perovskite QDs.
These CsPbX3 QD systems can emit blue, green, yellow and red colors with QYs of 70–95 % through facile composition controlling. The line-widths are less than 35 nm, possessing a wide color gamut. Room temperature procedures allow to produce QDs at low cost and in short time. The observed 40 meV exciton binding energy, halogen self-passivation effect, and CsPbX3@X quantum-well band alignment are proposed to guarantee the excitons generation and high-rate radiative recombination at room temperature.
Because of these superior merits, the researchers see great potential of such QDs in lighting and displays.
- CsPbX3 Quantum Dots for Lighting and Displays: Room-Temperature Synthesis, PhotolumineSRence Superiorities, Underlying Origins and White Light-Emitting Diodes,
Xiaoming Li, Ye Wu, Shengli Zhang, Bo Cai, Yu Gu, Jizhong Song, Haibo Zeng,
Adv. Funct. Mater. 2016.