White and blue temperature stable and efficient OLEDs using amorphous spiro transport and spiro emitting compounds

Hubert Spreitzer; Horst Vestweber; Philipp Stoessel; Heinrich Becker

doi:10.1117/12.416885

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2 February 2001 White and blue temperature stable and efficient OLEDs using amorphous spiro transport and spiro emitting compounds

Hubert Spreitzer; Horst Vestweber; Philipp Stoessel; Heinrich Becker

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Proceedings Volume 4105, Organic Light-Emitting Materials and Devices IV; (2001) https://doi.org/10.1117/12.416885
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The temperature stability of white and blue OLEDs was investigated by observing the I-V, EL-V and the spectral characteristics of various devices stored at elevated temperature (up to 130 degrees Celsius). Blue multilayer organic light emitting diodes (OLEDs) containing PEDT (polyethylenedioxythiophene) or PANI (polyaniline) derivatives as the hole injection and puffer layer, aromatic diamines like Spiro-TAD (2,2',7,7'- tetrakis(diphenylamino)spiro-9,9'-bifluorene) as a hole transport material (HTM), Spiro-DPVBi (2,2',7,7'- tetrakis(2,2-diphenylvinyl)spiro-9,9'-bifluorene) as an emitting material (EM) and of Alq₃ (tris(8-hydroxy- quinoline)aluminum) as the electron-injection and electron- transport layer (ETL) were fabricated. White OLEDs were prepared, containing an additional DCM (dicyanmethylene-2- methyl-6-(p-dimethylaminostyryl)-4H-pyran) doped Alq₃ layer between the Spiro-DPVBi and Alq₃ layer. Use of Spiro-TAD as a hole transport material (HTM) and of Spiro- DPVBi as an emitting material (EM) resulted in dramatically improved temperature stability: for the white and blue OLED no significant deterioration up to 130 degrees Celsius were found. Devices consisting of non spiro components like NPB and/or DPVBi already started to degrade at much lower temperatures.

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Hubert Spreitzer, Horst Vestweber, Philipp Stoessel, and Heinrich Becker "White and blue temperature stable and efficient OLEDs using amorphous spiro transport and spiro emitting compounds", Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); https://doi.org/10.1117/12.416885

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