Screening Approach for the Discovery of New Hybrid Perovskites with Efficient Photoemission

Abstract

Owing to quantum confinement, low-dimensional hybrid perovskite materials have recently shown a great potential for applications in optoelectronics. Such compounds can exhibit broad-or narrow-band light emission, lowtemperature solution processability, high thermal stability, and relatively high photoluminescence quantum yields (PLQY). However, the search for efficient phosphors with a specific set of characteristics remains difficult because the family of hybrid perovskites consists in an extremely large chemical system (i.e., different halides, metals, and organic molecules), and optical properties are not predictable prior to material synthesis and characterization. Here, is proposed a simple approach to screen a significant amount of new hybrid lead halide perovskites. The synthetic method by fast crystallization at low temperature enables the rapid identification of the materials exhibiting the targeted photoluminescence properties. This approach is tested for the discovery of hybrid lead halide perovskites with efficient white-light emission. Among 100 newly synthesized compounds, 5 exhibit intense white emission, and the in-depth characterization of a selected candidate shows high color rendering index (CRI) = 78 and a PLQY of 9%, which is equivalent to the record reported for hybrid perovskites. This compound exhibits a new structure type for warm white-light emitting hybrid perovskites with chains of corner-sharing PbX 6 .

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

“…[12,13] Recently,low-dimensional hybrid metal halides including hybrid perovskites have attracted agreat attention. [14][15][16][17] Their emissions can be extremely broad owing to exciton selftrapping,asoriginally reported by Nagami et al for ahybrid lead iodide. [18,19] Such emission offers rich opportunities for discovering single-phase white light emitters such as Cs 2 AgInCl 6 ,(EDBE)PbBr 4 (EDBE = 2,2'-(ethylenedioxy)bis(ethylammonium)), C 4 N 2 H 14 PbBr 4 ,( AMP)PbBr 5 .1/2H 2 O (AMP = 1-(2-aminoethyl)piperazine), or (TDMP)PbBr 4 (TDMP = trans-2,5-dimethylpiperaziniium).…”

“…[18,19] Such emission offers rich opportunities for discovering single-phase white light emitters such as Cs 2 AgInCl 6 ,(EDBE)PbBr 4 (EDBE = 2,2'-(ethylenedioxy)bis(ethylammonium)), C 4 N 2 H 14 PbBr 4 ,( AMP)PbBr 5 .1/2H 2 O (AMP = 1-(2-aminoethyl)piperazine), or (TDMP)PbBr 4 (TDMP = trans-2,5-dimethylpiperaziniium). [16,17,[20][21][22][23][24] Thecolor rendering index (CRI) of these materials can reach high values (ca. 70-90) owing to the broadband emission.…”

“…70-90) owing to the broadband emission. [16,23,25] However,i ns ome color-critical high-level applications,s uch as jewelry,photography,museums,and surgery,anultra-high CRI is required. [26] Through the comparison of the resulting emissions with solar spectrum (Supporting Information, Figure S1), it is observed that such emitters are not satisfactory for these applications,b ecause of the lack of either blue or/ and red components.T hus,a dding an appropriate emission band through doping can be an interesting strategy to improve the color rendering of such light sources.…”

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

“…Recently, low‐dimensional hybrid metal halides including hybrid perovskites have attracted a great attention . Their emissions can be extremely broad owing to exciton self‐trapping, as originally reported by Nagami et al.…”

“…for a hybrid lead iodide . Such emission offers rich opportunities for discovering single‐phase white light emitters such as Cs 2 AgInCl 6 , (EDBE)PbBr 4 (EDBE=2,2′‐(ethylenedioxy)bis(ethylammonium)), C 4 N 2 H 14 PbBr 4 , (AMP)PbBr 5 .1/2H 2 O (AMP=1‐(2‐aminoethyl)piperazine), or (TDMP)PbBr 4 (TDMP= trans ‐2,5‐dimethylpiperaziniium) . The color rendering index (CRI) of these materials can reach high values (ca.…”