Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3200947
Keywords
current density; electroluminescence; liquid films; liquid semiconductors; organic light emitting diodes; organic semiconductors; semiconductor thin films
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Funding
- Nissan Chemical Co.
- Grant-in-Aid for the global COE Program
- Ministry of Education, Culture, Sports and Technology of Japan
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We demonstrate an original organic light-emitting diode (OLED) having a neat liquid host of 9-(2-ethylhexyl)carbazole (EHCz) doped with a guest emitter of 5,6,11,12-tetraphenylnapthacene (rubrene). The device structure is composed of indium tin-oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulphonate)/EHCz:rubrene/Cs2CO3/ITO. We demonstrate that the liquid organic semiconducting layer surely transports charge carriers, leading to electroluminescence from rubrene with the highest external quantum efficiency of eta(ext)=0.03% at a current density of 0.26 mA/cm(2). Our demonstration of the liquid-OLEDs will open another possibility of organic semiconductors and light-emitting applications.
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