Abstract
Cs4PbBr6 crystals have been synthesized by an ultrasonication-assisted trace amount polar solvent method. The prepared green Cs4PbBr6 material was found to have high photoluminescence (PL) brightness and 10 ns PL lifetime. The prepared green light emitting device can achieve the maximum brightness of 3.8 × 109 cd/m2, which is nearly 100 times higher than a wick. The white light emitting device based on Cs4PbBr6 crystals has better performance than commercial products, which can cover 32.3% of the color gamut and achieves 107.3% coverage for International Commission on Illumination (CIE)1931 and 84.8% coverage for CIE1976.
Highlights
Clean energy and efficient energy conversion are essential to achieve sustainable development
If the trace amount solvent was changed from dimethyl sulfoxide (DMSO) to ethanol, no Cs4PbBr6 crystals could be synthesized
Even though the polarity of water is higher than DMSO, water decomposes the final product (Cs4PbBr6 crystals) immediately, which makes water not a good solvent
Summary
Clean energy and efficient energy conversion are essential to achieve sustainable development. Halide perovskites are promising materials that can efficiently convert solar energy into electricity as well as electricity into light energy. Zhang’s method for preparing Cs4PbBr6 nanocrystals requires a complex procedure in which Cs–oleic acid precursor, n-hexane, and oleic acid (OA) were quickly injected into the flask with vigorous stirring with PbBr2, HBr, OA, and oleylamine.. Zhang’s method for preparing Cs4PbBr6 nanocrystals requires a complex procedure in which Cs–oleic acid precursor, n-hexane, and oleic acid (OA) were quickly injected into the flask with vigorous stirring with PbBr2, HBr, OA, and oleylamine.21 These reported methods require either very long time, higher temperature, or more complicated steps in the preparation of Cs4PbBr6, and in some cases, there are certain restrictions for moisture and oxygen. A large amount of organic solvent has a huge impact on cost and environment
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