Abstract
Perovskite-based light-emitting diodes (PLEDs) have emerged as a promising alternative owning to the excellent optoelectronic properties including narrow emission linewidths, high photoluminescence quantum yield (PLQY), tunable emission wavelength, and high color purity. Over the past several years, significant progress has been obtained for green, red, and near-infrared PLEDs with a high external quantum efficiency (EQE) of over 20%. However, the development of blue PLEDs has been limited by several technical issues including poor film quality, inefficient device structure, higher trap density, and so on. To overcome these drawbacks with improved PLQY and EQE, we summarize and analyze the recent advances towards the development of three dimensional (3D), two dimensional (2D) and quasi-2D perovskites film employing composition and/or dimensional engineering. Moreover, the utilization of perovskite nanocrystals (PNCs) is also considered as a feasible strategy for the realization of high-performance blue PLEDs. We systematically evaluate the performance of sky-blue, pure-blue and deep blue PLEDs based on different perovskite materials. Finally, future prospective are proposed to promote the development of efficient blue PLEDs.
Highlights
Metal halide perovskites has a general formula of ABX3 (A+ monovalent organic or inorganic cation, e.g., CH3NH3+ (MA+), CH(NH2)2+ (FA+), Cs+; B2+ divalent metal cation such as Pb2+, Sn2+, Zn2+: X− halide anion, e.g., Cl−, Br−, I−, and SCN−) display outstanding optoelectronic properties including high charge carrier mobility, long excitation diffusion length, high absorption coefficient, narrow emission linewidth, tunable emission wavelengths from ultra-violet to near-infrared (Kumawat et al, 2019; Hu et al, 2020; Lu and Wei, 2020)
In 2014, the first Perovskite-based light-emitting diodes (PLEDs) operated at room temperature was developed by Tan et al with external quantum efficiency (EQE) of 0.76%, 0.1%, and 0.018% for near-infrared, red, and green emission, respectively (Tan et al, 2014)
The future prospective is proposed for preparing high-performance blue PLEDs
Summary
Review on Blue Perovskite LightEmitting Diodes: Recent Advances and Future Prospects. Perovskite-based light-emitting diodes (PLEDs) have emerged as a promising alternative owning to the excellent optoelectronic properties including narrow emission linewidths, high photoluminescence quantum yield (PLQY), tunable emission wavelength, and high color purity. The development of blue PLEDs has been limited by several technical issues including poor film quality, inefficient device structure, higher trap density, and so on. To overcome these drawbacks with improved PLQY and EQE, we summarize and analyze the recent advances towards the development of three dimensional (3D), two dimensional (2D) and quasi-2D perovskites film employing composition and/or dimensional engineering.
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