An efficient organic and inorganic hybrid interlayer for high performance inverted red cadmium-free quantum dot light-emitting diodes

Nagarjuna Naik Mude, Su Jeong Kim, Raju Lampande, Jang Hyuk Kwon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The efficiency and device lifetime of quantum dot light-emitting diode (QLED) devices suffer from the charge imbalance issue resulting from excess electron injection from the ZnO electron transport layer (ETL) to the quantum dot (QD) emissive layer (EML). Herein we report 1,3-bis(9-phenyl-1,10-phenanthrolin-2-yl)benzene (BPPB) small molecule ETL blended ZnO as an interlayer in inverted red indium phosphide (InP) based QLEDs to slow down the ZnO ETL mobility. The device with ZnO : BPPB (15 wt%) shows 16.7% external quantum efficiency and 595 h lifetime (T50) at 1000 cd m-2. Insertion of a thin hybrid interlayer reduces the electron injection to match the charge balance in the QD layer and also suppresses the interfacial exciton quenching between the ZnO ETL and QD EML.

Original languageEnglish
Pages (from-to)904-910
Number of pages7
JournalNanoscale Advances
Volume4
Issue number3
DOIs
Publication statusPublished - 7 Feb 2022

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