Effect of Refractive Index Contrast on Out-Coupling Efficiency of Corrugated OLEDs using Low-Refractive-Index LiF Interlayer

被引：12
|
作者：
Youn, Wooram [2 ]
Lee, Jae Woong [3 ]
Yu, Hyeonggeun [4 ]
Kim, Do Young [1 ]
机构：
[1] Oklahoma State Univ, Sch Mat Sci & Engn, Tulsa, OK 74106 USA
[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA
[3] Korea Inst Ind Technol, Adv Proc & Mat R&BD Grp, Incheon 21999, South Korea
[4] Korea Inst Sci & Technol, Adv Photo Elect Hybrids Res Ctr, Seoul 02792, South Korea
来源：
ACS APPLIED ELECTRONIC MATERIALS | 2020年 / 2卷 / 07期
关键词：
OLED; photonic band gap; light extraction; refractive index; Bragg diffraction efficiency; LIGHT-EMITTING-DIODES; EXTERNAL-QUANTUM-EFFICIENCY; EXTRACTION-EFFICIENCY;
D O I：
10.1021/acsaelm.0c00404
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In organic light-emitting diodes (OLEDs), the low out-coupling efficiency of 20-30% limits the external quantum efficiency (EQE). Corrugated structures for OLED light extraction can increase the out-coupling efficiency by extracting the thin-film-guided mode as well as the surface plasmon (SP) mode. To further enhance the out-coupling efficiency of a corrugated OLED, we increase the refractive index contrast by incorporating a low-index light out-coupling layer in the device and the resulting OLED has an external quantum efficiency of 67%. By fabricating these corrugated OLEDs with the emitting layer located at the first and second antinode positions, we confirm that the enhanced extraction comes from the enhanced extraction of thin-film-guided modes.
引用
收藏
页码：2218 / 2223
页数：6
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