Recent Advances toward High‐Efficiency Halide Perovskite Light‐Emitting Diodes: Review and Perspective

Abstract

PCE of 22% was reported. This PCE value is comparable to those of polycrystalline silicon solar cells, making it the most promising candidate for renewable energy generation in the near future. [11] In addition to the successful use of HPs in solar cells, these materials have also exhibited excellent performance in a wide range of other applications, such as photodetectors, [12][13][14][15] field-effect transistors, [16][17][18] gas sensors, [19] resistive-switching memory devices, [20][21][22][23][24][25] and light-emitting diodes (LEDs). [26][27][28][29][30][31] Among these, halide perovskite light-emitting diodes (HPLEDs) shown unprecedented performance with maximum luminance values of up to 91 000 cd m −2 and external quantum efficiencies (EQEs) of over 11.7%. [32,33] More Perovskite Light-Emitting Diodes interested in the modulation of the properties of 2D materials such as graphene, graphene oxide, transition-metal dichalcogenides, and halide perovskites, and their applications. He has combined his experience in optoelectronic devices with 2D materials and halide perovskites to focus his research on the optimization of the properties of 2D materials and their application to energy devices, such as OLEDs, organic photovoltaics, perovskite solar cells, light-emitting diodes, and gas sensors. Figure 1. a) Strategies for improving the efficiency of HPLEDs. b) EQEs of LEDs based on 3D HPs, layered HPs, and quantum-dot HPs which were reported from 2014 to 2017 (the data were extracted from Tables 1-3). a) From top and clockwise: Top right, outer images: Reproduced with permission. [30]

Emerging Conductive Atomic Force Microscopy for Metal Halide Perovskite Materials and Solar Cells

“…The facet orientation regulation has been considered as an effective route to elevate the device performance . 2D synchrotron radiation grazing incidence wide‐angle X‐ray scattering has been widely used to detect the crystal orientation . While, in order to clarify the relationship between grain orientation and photoelectric properties of perovskite at the same time, new representations are required.…”

“…[125] 2D synchrotron radiation grazing incidence wide-angle X-ray scattering has been widely used to detect the crystal orientation. [126][127][128] While, in order to clarify the relationship between grain orientation and photoelectric properties of perovskite at the same time, new representations are required. C-AFM is one of the powerful tools to acquire the morphology of perovskite grains and the current information of different facet orientations simultaneously at microscale, which is very effective to analyze how facet orientation affects the efficiency of PSCs.…”

Amplified Spontaneous Emission and Lasing in Lead Halide Perovskites: State of the Art and Perspectives

“…The demonstration of ASE and lasing under nanosecond pumping, together with the rapid evolution of the performances of perovskites LEDs [3], of course stimulate the interest toward electrically driven perovskite-based laser diodes. Despite the possibility to drive LEDs with nanosecond voltage pulses this target seems currently extremely ambitious if one compares the excitation regime needed for lasing with the current densities demonstrated to date in LEDs.…”

“…Lead halide perovskites also showed interesting photoluminescence (PL) and electroluminescence properties, which stimulated the research in light emitting devices, such as light emitting diodes (LEDs) [3].…”

Breakdown of the Static Picture of Defect Energetics in Halide Perovskites: The Case of the Br Vacancy in CsPbBr3

“…Halide perovskites (HaPs) have emerged as remarkably efficient materials for optoelectronic applications, notably for photovoltaics, but also for light emitting diodes and other devices. [1][2][3][4][5][6][7][8] One of the most intriguing features of HaPs is the very long lifetime of photoexcited carriers (up to several s), [9][10][11] which is essential for key device parameters, e.g., the open-circuit voltage of HaP-based photovoltaic cells. 12 These long lifetimes are particularly remarkable given that HaP compounds are typically fabricated using relatively low-energy, solution-based material syntheses.…”