Blue and white organic light emitting diodes based on a doped DPVBi emitting layer

Noëlla Lemaître; Jérémie Lavigne; Paul Raimond; Tony Maindron; Christine Denis; Pascal Maisse; Bernard Geffroy

doi:10.1117/12.619788

9 October 2005 Blue and white organic light emitting diodes based on a doped DPVBi emitting layer

Noëlla Lemaître, Jérémie Lavigne, Paul Raimond, Tony Maindron, Christine Denis, Pascal Maisse, Bernard Geffroy

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 593723 (2005) https://doi.org/10.1117/12.619788
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

Highly efficient blue and white light-emitting organic electroluminescent devices have been fabricated by evaporation of small molecules. The emitting material of the blue multilayer EL devices (ITO/CuPc/α-NPB/Doped DPVBi/Alq3/LiF/Al) is based on a DPVBi (4,4'-bis(2,2-diphenylvinyl)biphenyl) matrix. In order to increase the EL efficiency and to improve the blue colour, this emitting layer is doped with a derivative of distyryl biphenyl molecules: PR3491. After the optimisation of the percentage of dopant, quantum and current efficiencies of 5.7 % and 7 cd/A, respectively, are obtained for a deep blue diode with CIE chromaticity coordinates of (0.15, 0.14). White diodes have been also realized doping the DPVBi emitter or the α-NPB hole transporting layer (HTL) of the previous structure with rubrene. A double doped system has been finally realized from the deep blue diode (DPVBi doped with PR3491) and with rubrene in the HTL layer. After tuning the two percentages of dopant in order to balance the blue and the yellow contribution to the diode emission, a fairly pure white emission is obtained with CIE coordinates of (0.31, 0.34) and external efficiencies of 3.4 % and 8.7 cd/A at 10 mA/cm².

Citation Download Citation

Noëlla Lemaître, Jérémie Lavigne, Paul Raimond, Tony Maindron, Christine Denis, Pascal Maisse, and Bernard Geffroy "Blue and white organic light emitting diodes based on a doped DPVBi emitting layer", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593723 (9 October 2005); https://doi.org/10.1117/12.619788

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KEYWORDS

Electroluminescence

Doping

Diodes

Organic light emitting diodes

Molecules

Quantum efficiency

External quantum efficiency

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