Efficiency roll-off suppression in organic light-emitting diodes using size-tunable bimetallic bowtie nanoantennas at high current densities

Zhao, Y, Yun, F, Huang, Y ORCID: 0000-0001-7774-1024, Wu, Z, Li, Y, Jiao, B, Feng, L, Li, S, Ding, W and Zhang, Y (2016) Efficiency roll-off suppression in organic light-emitting diodes using size-tunable bimetallic bowtie nanoantennas at high current densities APPLIED PHYSICS LETTERS, 109 (1). 013303-. ISSN 0003-6951, 1077-3118

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Abstract

Size-tunable bimetallic bowtie nanoantennas have been utilized to suppress the efficiency roll-off characteristics in organic light-emitting diodes (OLEDs) using both the numerical and experimental approaches. The resonant range can be widened by the strong dual-atomic couplings in bimetallic bowtie nanoantennas. Compared with the green OLED with conventional bowtie nanoantennas at a high current density of 800 mA/cm², the measured efficiency roll-off ratio of the OLED with size-modulated bowtie nanoantennas is decreased from 53.2% to 41.8%, and the measured current efficiency is enhanced by 29.9%. When the size-modulated bowtie nanoantennas are utilized in blue phosphorescent OLEDs, the experimental roll-off ratio is suppressed from 43.6% to 25.9% at 250 mA/cm², and the measured current efficiency is also enhanced significantly. It is proposed that the efficiency roll-off suppression is mainly related to the enhanced localized surface plasmon effect, which leads to a shorter radiative lifetime.

Item Type:	Article
Uncontrolled Keywords:	40 Engineering, 4016 Materials Engineering
Depositing User:	Symplectic Admin
Date Deposited:	18 Oct 2016 08:59
Last Modified:	22 Jan 2026 07:37
DOI:	10.1063/1.4955129
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3003818
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