| 학회 | 한국재료학회 |
| 학술대회 | 2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 | 23권 2호 |
| 발표분야 | G. 나노/박막 재료 분과 |
| 제목 | Fabrication of dual patterned substrate for high light-extraction efficiency of white organic light-emitting diodes |
| 초록 | Organic Light Emitting Diodes have been intensely researched for high color gamut, fast response, applicability to flexible substrate, broad viewing angle, low power consumption and therefore internal quantum efficiency is improved to 100%. However, external quantum efficiency is below 30% because of glass substrate confined light, Wave-Guide Modes(WGMs) of ITO/glass interface and Surface Plasmon Polaritons(SPPs) loss of organic layer/metal interface. To solve this issue, a variety of light extraction techniques have been improved, such as microlens array, random surface, nano scattering structure, and random surface for enhancing external light extraction while micro cavity, photonic crystal, nano-sized scattering layer and diffractive grating layer for internal light extraction. In this study, we fabricated nano-in-micro structured aluminoborosilicate glass substrate to enhance light extraction efficiency using nanoimprinting of hydrogen silsesquioxane(HSQ) and subsequent inductively coupled plasma(ICP) etching. Optical properties of nano-in-micro structured glass substrate are characterized using UV-Visable spectroscopy. In addition, a Photo Research spectrometer(PR-650) and Keithely 2400 semiconductor parameter analyzer were used to measure the luminescent and electrical properties. The average diffused transmittance between 400 nm and 700 nm is about 69.8% while that of reference device is below 1%. The current density and power efficiencies of the reference device are 57.9 cd/A and 56.4 lm/w at a current density of 1 mA∕cm2 whereas, for the nano-in-micro device, the values increased by 21% and 27% to 70.3 cd/A and 71.8 lm/w, respectively. As a result, we confirmed our dual patterned substrate is high light-extracting efficient substrate for OLEDs. |
| 저자 | 김관, 김양두, 전준호, 백승호, 이헌 |
| 소속 | 고려대 |
| 키워드 | <P>Nanoimprint; aluminoborosilicate; light extraction structure; inductively coupled plasma etching; OLED</P> |
