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The Quantum Efficiency Roll-Off Effect in Near-Infrared Organic Electroluminescent Devices with Iridium Complexes Emitters
Abstract
The electroluminescence quantum efficiency roll-off in iridium(III)-based complexes, namely Ir(iqbt)2(dpm) and Ir(iqbt)3(iqbt=1 (benzo[b]thiophen-2-yl)-isoquinolinate, dpm=2,2,6,6-tetramethyl-3,5-heptanedionate) utilized as near-infrared emitters in organic light emitting diodes with remarkable external quantum efficiencies, up to circa 3%, 1.5% and 1%, are measured and analyzed. With a 5–6 weight % of emitters embedded in a host matrix, the double-layer solution-processed structure as well as analogous three-layer one extended by a hole-conducting film are investigated. The triplet-polaron, the Onsager electron-hole pair dissociation and the triplet-triplet annihilation approaches were used to reproduce the experimental data. The mutual annihilation of triplets in iridium emitters was identified as prevailingly controlling the moderate roll-off,with the interaction between those of iridium emitters and host matrixes found as being less probable. Following the fitting procedure, the relevant rate constant was estimated to be(0.5−12)×10−12cm3/s,values considered to be rather too high for disordered organic systems, which was assigned to the simplicity of the applied model. A coexistence of some other mechanisms is therefore inferred, ones, however, with a less significant contribution to the overall emission quenching.
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Authors (6)
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Wojciech Mróz
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Sagar Kesarkar
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Alberto Bossi dr
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma13081855
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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Materials
no. 13,
ISSN: 1996-1944 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Mróz W., Kesarkar S., Bossi A., Pelczarski D., Grygiel P., Stampor W.: The Quantum Efficiency Roll-Off Effect in Near-Infrared Organic Electroluminescent Devices with Iridium Complexes Emitters// Materials -Vol. 13,iss. 8 (2020), s.1855-
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ma13081855
- Verified by:
- Gdańsk University of Technology
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