Open AccessPolarized electroluminescence from organic light-emitting devices using photon recycling
Author(s) -
Byoungchoo Park,
Yong-Hak Huh,
Hong G. Jeon
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.019824
Subject(s) - polarizer , oled , optics , electroluminescence , materials science , waveplate , birefringence , optoelectronics , polarization (electrochemistry) , linear polarization , circular polarization , perpendicular , brightness , physics , laser , chemistry , geometry , mathematics , layer (electronics) , composite material , microstrip
We present results that show highly polarized electroluminescence (EL) from an organic light-emitting device (OLED) by using a quarter-wave (λ/4) retardation plate (QWP) film and a giant birefringent optical (GBO) photonic reflective polarizer. Polarized EL light of 13,400 cd/m(2) with high peak efficiencies (greater than 10 cd/A and 3.5 lm/W) was obtained from an OLED in this way. These values are almost double those of a polarized OLED that only uses a polarizer. The direction of polarization of the emitted EL light from the polarized OLED corresponded to the passing axis of the GBO reflective polarizer. Furthermore, the degree of linear polarization obtained, i.e. the ratio between the brightness of two linearly polarized EL emissions parallel and perpendicular to the passing axis, is greater than 40 over the whole range of emitted luminance.