Real-time beam shaping without additional optical elements

Felix Fries; Markus Fröbel; Pen Yiao Ang; Simone Lenk; Sebastian Reineke

doi:10.1038/s41377-018-0014-0

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Real-time beam shaping without additional optical elements

Original Articles

- Real-time beam shaping without additional optical elements
- Light: Science & Applications Vol. 7, Issue 4, Pages: 154-164(2018)
- Affiliations：
  
  Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, Nöthnitzer Straße 61, Dresden 01187, Germany
- Author bio：
  
  Felix Fries (felix.fries@tu-dresden.de)
  Sebastian Reineke (sebastian.reineke@tu-dresden.de)
- Funds：
- DOI：10.1038/s41377-018-0014-0
  CLC：
- Published：2018，
  
  Published Online：20 June 2018，
  
  Received：21 November 2017，
  
  Revised：23 February 2018，
  
  Accepted：06 March 2018
- Accepted：
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Fries, F. et al. Real-time beam shaping without additional optical elements. Light: Science & Applications, 4, 154-164 (2018).
DOI：

Fries, F. et al. Real-time beam shaping without additional optical elements. Light: Science & Applications, 4, 154-164 (2018). DOI： 10.1038/s41377-018-0014-0.

摘要

Abstract

Providing artificial light and enhancing the quality of the respective light sources is of continued interest in the fields of solid state

condensed matter

and semiconductor physics. Much research has been carried out to increase the luminous efficiency

lifetime and colour stability of such devices. However

the emission characteristics of a given light source do not necessarily comply with today's often sophisticated applications. Here

beam shaping addresses the transformation of a given light distribution into a customized form. This is typically achieved by secondary optical elements often sporting elaborate designs

where the actual light source takes up only a small fraction of the system's volume. Such designs limit the final light source to a single permanent operation mode

which can only be overcome by employing mechanically adjustable optical elements. Here we show that organic light-emitting diodes (OLEDs) can enable real-time regulation of a beam shape without relying on secondary optical elements and without using any mechanical adjustment. For a red light-emitting two-unit OLED architecture

we demonstrate the ability to continuously tune between strongly forward and strongly sideward emission

where the device efficiency is maintained at an application-relevant level ranging between 6 and 8% of external quantum efficiency for any chosen setting. In combination with additional optical elements

customizable and tuneable systems are possible

whereby the tuning stems from the light source itself rather than from the use of secondary optics.

关键词

Keywords

references

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