Directional polarized light emission from thin-film light emitting diodes

Liping Zhu

doi:10.1117/12.2595196

2 August 2021 Directional polarized light emission from thin-film light emitting diodes

Liping Zhu

Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 1180806 (2021) https://doi.org/10.1117/12.2595196
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

Light emitting diodes (LEDs) with directional and polarized light emission have many photonic applications, and beam shaping of these devices is fundamentally challenging because they are Lambertian light sources. In this work, using organic and perovskite LEDs (PeLEDs) for demonstrations, by selectively diffracting the TE waveguide mode while suppressing other optical modes in a nanostructured LED, we first demonstrated highly directional light emission from a full-area organic LED with a small divergence angle less than 3°, and a TE to TM polarization extinction ratio of 13. The highly selective diffraction of only the TE waveguide mode is possible due to the planarization of the device stack by thermal evaporation and solution processing. Using this strategy, we further demonstrated directional and polarized emission from a perovskite LED having a current efficiency 2.6 times compared to the reference planar device.

Conference Presentation

Citation Download Citation

Liping Zhu "Directional polarized light emission from thin-film light emitting diodes", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 1180806 (2 August 2021); https://doi.org/10.1117/12.2595196

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