Efficient organic manganese(ii) bromide green-light-emitting diodes enabled by manipulating the hole and electron transport layer

Atanu Jana, Vijaya Gopalan Sree, Qiankai Ba, Seong Chan Cho, Sang Uck Lee, Sangeun Cho, Yongcheol Jo, Abhishek Meena, Hyungsang Kim, Hyunsik Im

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Lead-free, non-toxic transition metal-based phosphorescent organic-inorganic hybrid (OIH) compounds are promising for next-generation flat-panel displays and solid-state light-emitting devices. In the present study, we fabricate highly efficient phosphorescent green-light-emitting diodes (PHOLEDs) using the lead-free, non-toxic, zero-dimensional OIH compound [(H2CCHCH2)(C6H5)3P]2MnBr4 (1), which exhibits an emission peak at 516 nm and a long lifetime of 441 μs. The long lifetime indicates the phosphorescent emissive nature of 1. Density functional theory calculations confirm that the narrow green emission from 1 is due to the highly localized electronic states of the valence and conduction bands. A flexible green-light-emitting phosphorescent substrate is successfully fabricated from 1 using a nylon membrane, indicating that 1 has a significant potential for use in flexible optoelectronic devices. By engineering the organic hole and electron transport layers, we achieve a highly efficient all-vacuum-deposited PHOLED with a current efficiency of 24.71 cd A-1, a power efficiency of 20.61 lm W-1, and an external quantum efficiency of 7.12%. Together, our findings will pave the way for the development of high-performance Mn(ii)-based LEDs.

Original languageEnglish
Pages (from-to)11314-11323
Number of pages10
JournalJournal of Materials Chemistry C
Volume9
Issue number34
DOIs
StatePublished - 14 Sep 2021

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