Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (46권2호 93-97)

Emission Characteristics of White Organic Light-Emitting Diodes Using Micro Lens Array Film

Micro Lens Array Film을 이용한 백색 OLED의 발광 특성

천현동;나현석;양재웅;주성후;
Chun, Hyun-Dong;Na, Hyunseok;Yang, Jae-Woong;Ju, Sung-Hoo;

대진대학교 신소재공학과;
Department of Advanced Materials Science & Engineering, Daejin University;

DOI : 10.5695/JKISE.2013.46.2.093

Abstract

We studied the emission characteristics of white phosphorescent organic light-emitting diodes (PHOLEDs), which were fabricated using a two-wavelength method. To optimize emission characteristics of white PHOLEDs, white PHOLEDs with co-doping and blue/co-doping emitting layer (EML) structures were fabricated using a host-dopant system. The total thickness of light-emitting layer was 25 nm and the dopant of blue and red was FIrpic and $Bt_2Ir(acac)$ in UGH3, respectively. In case of co-doping structure, applying micro lens array film showed efficiency improvement from the current efficiency 78.5 cd/A and power efficiency 40.4 lm/W to the current efficiency 131.1 cd/A and power efficiency 65 lm/W and blue / co-doping structure showed efficiency improvement from the current efficiency 43.8 cd/A and power efficiency 22 lm/W to the current efficiency 69 cd/A and power efficiency 32 lm/W.

Keywords

OLED;White;MLA;Efficiency;Spectrum;