White organic light emitting diodes combining the phosphorescent green and orange-red emitting systems fac tris(2-phenylpyridine) iridium doped -tris(-carbazolyl)-triphenylamine (TCTA) and iridium(III)bis(2-methyldibenzo-[f,h]quinoxaline)(acetylacetonate) doped -di(naphthalen-1-yl)--diphenyl-benzidine with the blue fluorescent dye -tetrakis(2,2-diphenylvinyl)spiro--bifluorene (Spiro-DPVBi) are presented. By introducing a thin layer of coevaporated TCTA and (1,3,5-benzenetriyl) tris-[1-phenyl-1H-benzimidazole] between the phosphorescent and the fluorescent region, both singlet and triplet excitons are confined efficiently, whereas charge carriers still pass easily this interlayer. Furthermore, the interlayer suppresses Dexter transfer of the phosphorescent excitons to the nonradiative triplet state of Spiro-DPVBi. Best devices reach a current efficiency of at and a color rendering index of 85 at warm white CIE chromaticity coordinates of (0.47, 0.42). Due to the use of electrically doped charge transport layers, are obtained at with a power efficiency of .
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21 August 2006
Research Article|
August 22 2006
Highly efficient white organic light emitting diodes comprising an interlayer to separate fluorescent and phosphorescent regions
Gregor Schwartz;
Gregor Schwartz
a)
Institut für Angewandte Photophysik,
Technische Universität Dresden
, 01069 Dresden, Germany
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Karsten Fehse;
Karsten Fehse
Institut für Angewandte Photophysik,
Technische Universität Dresden
, 01069 Dresden, Germany
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Martin Pfeiffer;
Martin Pfeiffer
Institut für Angewandte Photophysik,
Technische Universität Dresden
, 01069 Dresden, Germany
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Karsten Walzer;
Karsten Walzer
Institut für Angewandte Photophysik,
Technische Universität Dresden
, 01069 Dresden, Germany
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Karl Leo
Karl Leo
Institut für Angewandte Photophysik,
Technische Universität Dresden
, 01069 Dresden, Germany
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a)
Electronic mail: schwartz@iapp.de
Appl. Phys. Lett. 89, 083509 (2006)
Article history
Received:
March 06 2006
Accepted:
July 03 2006
Citation
Gregor Schwartz, Karsten Fehse, Martin Pfeiffer, Karsten Walzer, Karl Leo; Highly efficient white organic light emitting diodes comprising an interlayer to separate fluorescent and phosphorescent regions. Appl. Phys. Lett. 21 August 2006; 89 (8): 083509. https://doi.org/10.1063/1.2338588
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