Towards next generation white LEDs: optics-electronics synergistic effect in a single-layer heterophase halide perovskite

Abstract

A novel concept of the heterophase optics-electronics synergistic effect has been demonstrated in a single-layer α/δ-heterophase perovskite CsPbI3 in order to realize white LEDs featuring only one broadband emissive layer.

Deuterated N,N-dimethylformamide (DMF-d7) as an additive to enhance the CsPbI3 solar cell efficiency

“…As a star material, perovskites have become the best candidate for the light-absorbing layer of next-generation solar cells, which is mainly determined by their excellent photoelectric properties. [1][2][3] The most shocking thing is that the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has increased at a rocket-like speed from the initial 3.8% to the current 25.5% in the past decade or so. 4 Nevertheless, in organic-inorganic hybrid perovskites, the organic components, namely, methylamine (MA) or formamidine (FA), easily volatilize and migrate when exposed to high temperature and light, resulting in poor PSCs stability.…”

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

“…8o–q ). In another work by Chen J. et al, a heterophase synergistic photoelectric effect was proposed to achieve high-efficiency electroluminescence from STEs 28 , 94 – 96 . By a controllable phase transition of perovskite CsPbI 3 QDs, the α -phase and δ -phase were evenly distributed in the single-layer CsPbI 3 film and exhibited a synergistic photoelectric effect.…”

Perspective on Metal Halides with Self‐Trapped Exciton toward White Light‐Emitting Diodes

“…[ 8 ] Aside from the narrow emission feature of metal halide perovskites, the broadband emission from self‐trapped excitons (STEs) in metal halide materials is also attractive due to their potential in realizing high‐quality white‐light‐emitting diodes (WLEDs). [ 9–12 ] The STEs from alkali halides and alkaline‐earth halides have been studied since 20th century, with the focus mainly on the inner mechanism. [ 13 ] However, the low PLQY at room temperature, high excitation energy, ultraviolet emission and easy deliquescence impede their real application in electroluminescence devices.…”