Morphology-Independent Stable White-Light Emission from Self-Assembled Two-Dimensional Perovskites Driven by Strong Exciton-Phonon Coupling to the Organic Framework

作者：Thirumal Krishnamoorthy; Chong Wee Kiang; Xie Wei; Ganguly Rakesh; Muduli Subas Kumar; Sherburne Matthew; Asta Mark; Mhaisalkar Subodh; Sum Tze Chien; Soo Han Sen; Mathews Nripan

来源：Chemistry of Materials, 2017, 29(9): 3947-3953.

DOI：10.1021/acs.chemmater.7b00073

Hybrid two-dimensional (2D) lead halide perovskites have been employed in optoelectronic applications, including white-light emission for light-emitting diodes (LEDs). However, until now, there have been limited reports about white-light-emitting lead halide perovskites with experimental insights into the mechanism of the broadband emission. Here, we present white-light emission from a 2D hybrid lead chloride perovskite, using the widely known phenethylammonium cation. The single-crystal X-ray structural data, time-resolved photophysical measurements, and density functional theory calculations are consistent with broadband emission arising from strong exciton-phonon coupling with the organic lattice, which is independent of surface defects. The phenethylammonium lead chloride material exhibits a remarkably high color rendering index of 84, a CIE coordinate of (0.37,0.42), a CCT of 4426, and photostability, making it ideal for natural white LED applications.

• 出版日期2017-5-9