Weak-microcavity organic light-emitting diodes with improved light out-coupling.
We propose and demonstrate weak-microcavity organic light-emitting diode (OLED) displays with improved light-extraction and viewing-angle characteristics. A single pair of low- and high-index layers is inserted between indium tin oxide (ITO) and a glass substrate. The electroluminescent (EL) efficiencies of discrete red, green, and blue weak-microcavity OLEDs are enhanced by 56%, 107%, and 26%, respectively, with improved color purity. Moreover, full-color passive-matrix bottom-emitting OLED displays are fabricated by employing low-index layers of two thicknesses. As a display, the EL efficiency of white color was 27% higher than that of a conventional OLED display.
Cho
Sang-Hwan
SH
Department of Physics, KAIST, Daejeon 305-701, Korea. cho0825@kaist.ac.kr
Song
Young-Woo
YW
Lee
Joon-gu
JG
Kim
Yoon-Chang
YC
Lee
Jong Hyuk
JH
Ha
Jaeheung
J
Oh
Jong-Suk
JS
Lee
So Young
SY
Lee
Sun Young
SY
Hwang
Kyu Hwan
KH
Zang
Dong-Sik
DS
Lee
Yong-Hee
YH
D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D009930:Organic Chemicals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D012666:Semiconductors; D017971:Tin Compounds / Q000737:chemistry*
D009930:Organic Chemicals; D017971:Tin Compounds; C109984:indium tin oxide