On the exciton profile in OLEDs-seamless optical and electrical modeling
article
We present a comprehensive model to simulate organic light-emitting devices (OLEDs)that includes a seamless coupling of charges, excitons and photons. The comprehensivemodel accounts for the position dependent exciton lifetime due to the optical environmentin the multilayer OLED structures. We first study the effect of different charge mobilitiesand quantum efficiencies of the light-emitting material on the exciton profiles. Moreover,we discuss the extension of an optical model to account for the exciton dynamics. Thiscomprehensive optical model is validated and justified on the basis of consistency checks.Namely, we show that our comprehensive optical model can take the cavity effects as seenin simulation results of the comprehensive electrical model into account. The advantage ofthe comprehensive optical model is a quick and accurate insight into the exciton physics if applied together with a nonlinear least square (NLSQ) fitting method. Finally, we apply thecomprehensive optical model with the NLSQ-method in order to extract the exciton pro-files from emission spectra of a blue light-emitting polymer diode (PLED) measured at different current levels.
TNO Identifier
868337
ISSN
15661199
Source
Organic Electronics, 13, pp. 1827-1835.
Publisher
Elsevier
Pages
1827-1835
Files
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