Vapor-deposited organic light-emitting devices lighting

Vapor-Deposited Organic Light-Emitting Devices... 

VAPOR-DEPOSITED ORGANIC LIGHT-EMITTING DEVICES... 

One of the most common uses for peri-substituted pentacene is as a red emitter in organic light-emitting diodes (OLEDs). Diphenylpentacene, for example, has a fluorescence quantum yield of 30% as a 0.55% dopant in Alq3, yielding OLED devices with efficiencies near the theoretical maximum [34]. Variation of the aryl substituents improves solubility and processing and can increase fluorescence quantum yield (for example, pentacene 25 has a composite fluorescence quantum yield of 32%) [35]. There is one report of the use of diaryl pentacenes in FET devices, but the performance was generally poor (hole mobility for vapor-deposited 23 was of the order of 10-8 cm2 V-1 s-1) [30]. 

CVD = chemical vapor deposition DH = double heterostructure H = homojunction device ITO = indium tin oxide LEDs = light emitting diodes LPE = liquid phase epitaxy MBE = molecular beam epitaxy MOCVD = metal organic chemical vapor deposition PPV = p-phenylenevinyl-ene PEDOT = polyethylene dioxythiophene TFEL = Thin film electroluminescent VPE = vapor phase epitaxy. 

Zhou, T.X., Ngo, T., Brown, J.J., Shtein, M., and Forrest, S.R., Stable and efficient electrophosphorescent organic light-emitting devices grown by organic vapor phase deposition. Applied Physics Letters, 2005. 86 021107. 

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