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

页码：2218 / 2223

页数：6

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