2007
DOI: 10.1088/0268-1242/22/3/007
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Blue and white organic light-emitting devices using oligo(phenylenvinylene) as a blue emitter

Abstract: Highly bright and efficient blue and white organic light-emitting devices based on oligo(phenylenvinylene) derivatives, 1,4-di(4 -N,Ndiphenylaminostyryl) benzene (DPA-DSB) and 2,5,2 ,5 -tetrastyryl-biphenyl (TSB), are fabricated. In the blue device, using DPA-DSB doped TSB as a blue emitter, due to efficient energy transfer from TSB to DPA-DSB and depression of concentration quenching of the dopant, a maximum brightness of 17 350 cd m −2 and a maximum luminous efficiency of 12.18 cd A −1 are obtained. In the w… Show more

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Cited by 5 publications
(2 citation statements)
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“…While the PL efficiencies ͑or quantum yields͒ of these all-in-one materials are found to be in the range of 80%-90% in solution and a few percent in thin films, the EL efficiencies of our basic devices are not found to be in a range comparable with the best reported organic LEDs ͑OLEDs͒. 31,32 Using appropriate calibration parameters to account for the spectral response function of the photodiode detector and the standard eye response function, we typically see surface brightness of order 10-100 cd/ m 2 at relatively high driving voltages of 5 -10 V, current efficiencies of order 0.01-0.1 cd/ A, and external quantum efficiencies of up to 0.1%. A major constraint on the device performance is the very thin nature of the films which may be spin coated from solutions of such oligomeric materials, which have a much lower viscosity than solutions of conjugated polymers, for example.…”
Section: Device Characterizationmentioning
confidence: 60%
“…While the PL efficiencies ͑or quantum yields͒ of these all-in-one materials are found to be in the range of 80%-90% in solution and a few percent in thin films, the EL efficiencies of our basic devices are not found to be in a range comparable with the best reported organic LEDs ͑OLEDs͒. 31,32 Using appropriate calibration parameters to account for the spectral response function of the photodiode detector and the standard eye response function, we typically see surface brightness of order 10-100 cd/ m 2 at relatively high driving voltages of 5 -10 V, current efficiencies of order 0.01-0.1 cd/ A, and external quantum efficiencies of up to 0.1%. A major constraint on the device performance is the very thin nature of the films which may be spin coated from solutions of such oligomeric materials, which have a much lower viscosity than solutions of conjugated polymers, for example.…”
Section: Device Characterizationmentioning
confidence: 60%
“…10 Another approach for efficient injection of holes into organic layers is the use of polymer layers based on poly͑3,4-ethylenedioxythiophene͒: poly͑styrenesulfonate͒ ͑PEDOT:PSS͒ with an ITO layer underneath. 11,12 Commonly, the ITO layer is needed to provide a homogeneous lateral current distribution due to the several orders of magnitude lower conductivity of the polymer compared to metals or ITO. However, due to the very recent development of highly conductive formulations of PEDOT:PSS with low absorption in the visible, it is now possible to use PEDOT:PSS with a conductivity of up to 500 S / cm as anode without the need of an inorganic layer underneath.…”
Section: Introductionmentioning
confidence: 99%