Issue 15, 2020, Issue in Progress

Efficient fluorescent OLEDS based on assistant acceptor modulated HLCT emissive state for enhancing singlet exciton utilization

Abstract

Phenylamine phenanthroimidazole based bipolar compounds with donor–acceptor (D–A) architecture namely, 4-(1-(2,3-dihydrobenzo[b][1,4]dioxin-5-yl)-6,9-di(pyren-4-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenylaniline (DDPPPA) and 4′-(1-(2,3-dihydrobenzo[b][1,4]dioxin-5-yl)-6,9-di(pyren-4-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,1′-biphenyl]-4-amine (DDPBA) have been synthesized with highly fluorescent pyrene moieties at C6- and C9-positions. The C6 and C9 modification enhanced the thermal, photochemical and electroluminescent properties. Both molecules were employed as blue emitters in non doped organic light emitting devices (OLEDs) and show high performances due to hybridized local and charge-transfer properties. An OLED with DDPPPA/DDPBA emissive layer shows deep-blue emission with maximum external quantum efficiency (ηex), current efficiency (ηc) and power efficiency (ηp) of 5.7/6.0%, 10.5/12.0 cd A−1 and 8.3/9.2 lm W−1, respectively. Both devices show high singlet exciton utilizing efficiency (ηs) of DDPPPA-31.33% and DDPBA-35.29%. The doped device m-MTDATA:DDPPPA/m-MTDATA:DDPBA shows maximum efficiencies of ηc −7.4/8.23 cd A−1; ηp −5.8/6.13 lm W−1; ηex −4.72/5.63% (5 wt%):ηc −8.36/9.15 cd A−1; ηp −6.32/6.65 lm W−1; ηex −4.86/5.45% (10 wt%):ηc −9.58/10.02 cd A−1; ηp −7.8/8.25 lm W−1; ηex −5.96/6.25% (20 wt%). The doped device based on TAPC host TAPC:DDPPPA/TAPC:DDPBA exhibits maximum efficiencies of ηc −9.60/10.03 cd A−1; ηp −7.81/8.26 lm W−1; ηex −5.96/6.25% (20 wt%).

Graphical abstract: Efficient fluorescent OLEDS based on assistant acceptor modulated HLCT emissive state for enhancing singlet exciton utilization

Supplementary files

Article information

Article type
Paper
Submitted
21 Jan 2020
Accepted
20 Feb 2020
First published
02 Mar 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 8866-8879

Efficient fluorescent OLEDS based on assistant acceptor modulated HLCT emissive state for enhancing singlet exciton utilization

J. Jayabharathi, J. Anudeebhana, V. Thanikachalam and S. Sivaraj, RSC Adv., 2020, 10, 8866 DOI: 10.1039/D0RA00658K

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