High Performance of Blue-Emitting CsPbBr₃ Quantum Dots Synthesized at Room Temperature

The excellent light-emitting characteristics of all inorganic halide perovskite quantum dots (IHQD) over hybrid perovskite QDs in terms of various optoelectronic properties has channelized the focus area of wide-spread research to further enhancement of the quality of IHQDs. However, blue emitting IHQDs are still struggling to compete with green and red IHQDs and generally exhibit low efficiency in luminescence. In this work, we present a facile approach to synthesize blue-emitting CsPbBr3 QDs under ambient conditions via an antisolvent method. The prepared QDs under ultraviolet light of 365 nm emit light with the emission wavelength experiencing red shift from 464 to 471 nm over a period of 18 days. The photoluminescence quantum yield is ~55.7%. The XRD pattern of the prepared QDs reveals dominant peaks between 2 to 10 degrees for 2θ, significantly different from the results reported in literature. The approach used in this work can provide a unique approach to produce blue emitting perovskite QDs of high quality.
Acknowledgements:
FY is grateful for the support by the NSF through the grant CBET-2018411 monitored by Dr. Nora F Savage.