publication . Article . 2018

Effect of matrix anisotropy on theapparent emitter orientation inOrganic LED

Norbert Danz; Nils Haase; Antonia Morherr; ChristofPflumm; Birk Fritsch;
Open Access
  • Published: 22 May 2018
Spontaneously aligning emitter molecules can improve the external efficiency of OLED devices and have beenreportedfor different types of emittersdoped into suitable hosts. Similar to the morphological alignment of the active molecules, a birefringence of the host affects the apparent emitter orientation. In order to investigate this effect experimentally, Ir(ppy)3is co-evaporated into the emitting layer of OLED using hosts with different birefringence properties. Analyzing the electroluminescence emission patterns quantitatively reveals the apparent orientation distribution of the emitters. The results emphasize that host birefringence can be used to suppress pe...
free text keywords: organic light-emitting diode, electroluminescence, birefringence, emitter orientation, optical simulation
Funded by
Development of high-performance, hyperfluorescence OLEDs for use in display applications and solid state lighting
  • Funder: European Commission (EC)
  • Project Code: 732013
  • Funding stream: H2020 | RIA
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Article . 2018
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