Blue Perovskite Light‐Emitting Diodes Using Multifunctional Small Molecule Dopants

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Unbalanced charge carrier injections and high densities of non‐radiative recombination channels are still major obstacles to advancing high‐efficiency blue perovskite light‐emitting diodes (LEDs). Here, a deep‐HOMO level p ‐type small molecule, (2‐(3,6‐dibromo‐9H‐carbazol‐9‐yl)ethyl)phosphonic acid, doped in perovskites for building better‐balanced injection controlling over defects is demonstrated. During the film deposition process, most molecules extruded from precursor solution bottom top surfaces films. This unique distribution can construct due improved hole retarded electron by its suitable energy‐level structure, along with modulation all bulk at surface films formation covalent bonds functional moiety. With this approach, series LEDs designed external quantum efficiencies (EQEs) up 24.03% (at luminance 113 cd m −2 emission peak 485 nm), 16.61% 51 476 nm) 8.55% 30 perk 467 encouraging operational stability.

Language: Английский

π-Conjugated molecule-based self-assembled monolayers enable high-efficiency pure-blue perovskite LEDs

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162261 - 162261

Published: April 1, 2025

Language: Английский