Stability of Perovskite Light Sources: Status and Challenges

Abstract

Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances of the degradation models for perovskites and strategies for enhancing the stability of the corresponding light sources are summarized. Improving the stability and quality of perovskite materials is a common way for developing stable perovskite light sources. For strengthening the stability of perovskite light‐emitting diodes, approaches such as surface and interface engineering and employing more stable hole injection layers are effective. To enhance the stability of perovskite amplified spontaneous emission and lasers, methods such as protecting perovskites by materials with high intrinsic thermal conductivity and high stability, better thermal managements, and reducing the threshold carrier densities are useful. This work will be helpful for further prompting the performances, especially the stability of perovskite light sources in this fantastic field.

Polaron and Spin Dynamics in Organic–Inorganic Lead Halide Perovskite Nanocrystals

“…Organic–inorganic lead halide perovskite (OILHP) nanocrystals (NCs) of the general formula APbX 3 (A = methylammonium (MA + )/formamidinium (FA + )/Cs + /Rb + and X = I/Br/Cl) are extremely interesting for a wide range of applications in electronics, optoelectronics, and quantum information processing. [ 1–6 ] OILHP NCs show low trap density (10 10 cm –3 ) and exceptional defect tolerance even when prepared at room temperature, where a high defect density is unavoidable. [ 7–11 ] Seminal demonstrations of defect tolerance include charge carrier lifetimes of ≈2 µs, long carrier diffusion lengths of ≈10 µm, and high photoluminescence (PL) quantum yield.…”

Halide Perovskite Light‐Emitting Diode Technologies

“…[119][120][121] Compared to the low electric field across the absorber layer in perovskite solar cells under operation, the high bias applied in PeLEDs based on relatively thinner active layers (≈500 nm in solar cells to ≈30 nm in PeLEDs) causes severe ion migration in the devices, facilitating structural degradation, charge accumulation at interfaces, and corrosion of metal electrodes. [121,122] Methods applying protecting layers, [123,124] nonmetallic electrodes, [125,126] and MA-free perovskite [127,128] have shown promising improvements in device stability. However, the operational degradation of PeLEDs is not fully understood.…”

Research progress of full electroluminescent white light-emitting diodes based on a single emissive layer

“…Perovskite emitters have become desirable materials in recent years because of their excellent photoelectric properties, such as their high photoluminescence quantum yields (PLQYs) and bipolar carrier mobility, and they have great potential in lighting and displays 67 – 74 . Many PeLEDs have been demonstrated with EQEs higher than 20% in the green 75 – 77 , red 78 , 79 , and near-infrared 80 – 82 regions.…”