期刊
ORGANIC ELECTRONICS
卷 89, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.orgel.2020.106049
关键词
OLED; Optical out-coupling; High-index substrates; Horizontal emitters
资金
- Ministry of Science and Technology of Taiwan [MOST 107-2221-E-002-160-MY3, 108-2221-E-002-148-MY3]
- National Natural Science Foundation of P. R. China [91833304, 51573141]
- National Key R&D Program of China [2016YFB0401002]
- Ministry of Education (MOE)
- Ministry of Science and Technology (MOST) of Taiwan
The combination of high-index substrates and horizontal-dipole emitters, along with other optimized conditions, can greatly enhance the optical out-coupling efficiency, leading to the successful realization of OLED devices with external quantum efficiency exceeding 80%.
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 phi(sub) (and perhaps similarly high OLED external quantum efficiencies) of similar to 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 similar to 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.
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