Dr. Sam Hsu's research featured on the inside Back Cover of Journal of Material Chemistry A

Dr. Sam Hsu, Assistant Professor, has reported that effective heterogeneous charge transfer of zero-dimensional Cs₄PbBr₆ emitters at the interface of the electrode and electrolyte results in red-shifted ECL emission in the presence of benzoyl peroxide (BPO) as the co-reactant. The result has been published and featured on the inside Back Cover of a top general journal – Journal of Material Chemistry A (https://pubs.rsc.org/en/content/articlelanding/2020/ta/d0ta06076c#!divAbstract). The development of zero-dimensional perovskite emitters opens up a new avenue in the field of emerging optoelectronic and biosensing technologies, including but not limited to ECL devices, ECL immunoassays, organic light-emitting diodes, light-emitting electrochemical cells, and other bio-related detections.

Cs₄PbBr₆ exhibits its outstanding photoluminescence properties; however, its electron transfer dynamics and electrochemical behaviors still remain unknown. Dr. Hsu’s team has discovered stronger electronic coupling and effective heterogeneous charge transfer at the interface of electrode and electrolyte of Cs₄PbBr₆ using a combination of photophysical and electrochemical techniques. Briefly, Dr. Hsu’s team fabricated the 0-D Cs₄PbBr₆ perovskite emitters with the detailed studies of the exciton transport and electrochemical dynamics by utilizing temperature-dependent transient photoluminescence (TRPL) and electrogenerated chemiluminescence (ECL) techniques, respectively. Stronger electronic coupling of Cs₄PbBr₆ emitters arises from the overlap of electronic wavefunctions, indicating the increased possibility for the generation of electrochemiluminescence. At the interface of electrode and electrolyte, the di?usion coe?cient and heterogeneous electron transfer of Cs₄PbBr₆ are more e?cient while compared to typical CsPbBr₃, as determined by a series of electrochemical methods. In summary, the enhanced performance of perovskite emitters by utilizing dimensionality engineering can be achieved, providing new insights into the development of next-generation luminescent materials for practical applications in the emerging field of electronic and photonic technology.