Subwavelength particle layers for improved light outcoupling of OLEDs

Helmut Bechtel; Wolfgang Busselt; Joachim Opitz

doi:10.1117/12.555817

10 November 2004 Subwavelength particle layers for improved light outcoupling of OLEDs

Helmut Bechtel, Wolfgang Busselt, Joachim Opitz

Proceedings Volume 5519, Organic Light-Emitting Materials and Devices VIII; (2004) https://doi.org/10.1117/12.555817
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Subwavelength silica particle layers have been applied between glass and thin film luminescent layers of Alq3 and a polymer MEH-PPV layer, respectively. The layers acted as a randomised two-dimensional diffraction lattice, which increased the fraction of emitted power from thin film organic layers into air. In contrast to perfectly ordered structures strong interference emission patterns did not occur. Still, an optical feedback of the particle layer on the emission spectrum could be observed, which can be used to improve colour saturation for blue and green emission and to increase the lumen efficiency for red emission, without changing the colour point of the red emitter. In photoluminescence experiments a gain factor of 3 and 2.5 in light outcoupling was realized for Alq₃ and MEH-PPV layers, respectively. With a MEH-PPV polymer OLED device an efficiency gain of 30 to 40 % has been realized in electroluminescence.

Citation Download Citation

Helmut Bechtel, Wolfgang Busselt, and Joachim Opitz "Subwavelength particle layers for improved light outcoupling of OLEDs", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); https://doi.org/10.1117/12.555817

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