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Thermally Activated Delayed Fluorescence of Co-deposited Copper(I) complexes: Cost-effective Emitters for Highly Efficient Organic Light-Emitting Diodes

Abstract

Two carboline derivatives 5-(3'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-3-yl)-5H-pyrido[3,2-b]indole (CzBPDCb) and 9-(3'-(9H-carbazol-9-yl)-[1,1'-biphenyl]-3-yl)-9H-pyrido[2,3-b]indole (CzBPCb) were employed as both ligand and hosts and co-deposited with CuI to form emissive Cu(I) complexes. The structure-properties relationships were studied to demonstrate the strategy of achieving highly efficient organic light emitting diodes (OLEDs) of thermally activated delayed fluorescence (TADF). Co-deposited CzBPDCb:CuI films showed photoluminescence at 520 nm with TADF feature of a delayed decay component (, 1.05 μs) and a prompt decay component (, 5.11 ns). Its OLED exhibited a maximum external quantum efficiency (EQE) of 17.5 %, a current efficiency (CE) of 53.84 cd A-1, and a power efficiency (PE) of 48.31 lm W-1. The device also showed a low efficiency roll-off of 48.1 cd A-1 at 100 cd m-2, 41.8 cd A-1 at 1000 cd m-2, and 38.5 cd A-1 at 2000 cd m-2, respectively. While as a comparison, CzBPCb:CuI-based OLED only showed a maximum EQE of 3.24 %, CE of 8.58 cd A-1, and PE of 6.24 lm W-1. CzBPDCb has a δ-carboline unit with the benefit of nitrogen atom locating outsider of molecule, which could efficiently coordinate with CuI resulting in higher efficiencies. This promising result gives us a unique strategy to development a series of TADF emitters by co-depositing normal organic ligand and copper source and cost-effective OLED.

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Publication details

The article was received on 09 Apr 2017, accepted on 15 Jun 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01531C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Thermally Activated Delayed Fluorescence of Co-deposited Copper(I) complexes: Cost-effective Emitters for Highly Efficient Organic Light-Emitting Diodes

    Z. Wang, J. Zhu, Z. Liu, P. Wu, H. Wang, Z. Zhang and B. Wei, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01531C

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