Realization of exceeding 80% external quantum efficiency in organic light-emitting diodes using high-index substrates and highly horizontal emitters

Autor: Fan Ni, Xuan Zeng, Kai-Chen Lin, Wei-Kai Lee, Shaolong Gong, Yu-Hsin Huang, Sheng-Wen Wen, Chung-Chih Wu, Po-Jui Chen, Bo-Kai Wang, Chuluo Yang
Rok vydání: 2021
Předmět:
Zdroj: Organic Electronics. 89:106049
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2020.106049
Popis: Although both high-index substrates and horizontal-dipole emitters have been shown to be facile approaches for enhancing OLED (organic light emitting diode) light extraction, the full benefits and potential of their combination for OLED optical out-coupling have not been thoroughly studied and explored. Simulation studies indicate that very high optical coupling efficiency into substrates ϕsub (and perhaps similarly high OLED external quantum efficiencies) of ~90% can be possibly obtained with both high-index substrates (refractive index >1.8–1.9) and highly horizontal-dipole emitters (horizontal dipole ratio >85%), together with adoption of low-index or index-matching carrier transport layers and optimization of organic layer and transparent electrode thicknesses. With these judicious device design conditions, all waveguided modes and surface plasmon modes in devices can be effectively suppressed for optimal optical out-coupling. Finally, combining the sapphire substrate having high index of n~1.78, the recently developed OLED emitters having high horizontal emitting dipole ratio of up to 87%, and simple external extraction lens, OLED devices having external quantum efficiency of over 80% was successfully realized.
Databáze: OpenAIRE
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