Optimization of the carrier recombination and transmission properties in perovskite LEDs by doping poly (4-vinylpyridine) and graphene quantum dots made of chitin
Journal
Chemical Engineering Journal
Journal Volume
444
Date Issued
2022
Author(s)
Abstract
Light emission intensity and a lifetime of perovskite light-emitting diodes (PeLEDs) have improved considerably through fine-tuning the regulation of carriers’ recombination and transport. This study found that adding poly (4-vinylpyridine) within a CsxPbBry system leads to a dipole–dipole interaction of pyridine-N and Pb2+. This interaction increases the solubility of the CsxPbBry precursor solution, which stabilizes the CsxPbBry crystal structure and induces a CsPbBr3 unitary state. The interaction further generates a polaron region and causes the orderly distribution of excess carriers in the electric field, thus preventing disordered surface charges from structurally damaging the crystal. The PEDOT:PSS hole transport layer mixed with a graphene quantum dot made of chitin tunes the highest occupied molecular orbital to improve carrier transmission efficiency. We fabricated PeLEDs with a peak luminance of 20420 cd m−2 and a fatigue half-life four times higher than original PeLEDs. This stable performance of the device can hasten the commercial development of PeLEDs. © 2022 Elsevier B.V.
Subjects
CsPbxBry; Dipole–dipole interaction; Graphene quantum dot; HOMO engineering; PeLEDs; Poly(4-Vinylpyridine)
SDGs
Type
journal article