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Measuring the profile of the emission zone in polymeric organic light-emitting diodes
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Image of FIG. 1.

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FIG. 1.

(a) PL spectra of 90 nm thick films of the blue-emitting polymers B1 (solid) and B2 (dotted). From these, the internal emission spectra of B1 (dashed) and B2 (dash-dotted) were extracted. (b) Simulated EL spectra for an OLED with a 90 nm B1 layer sandwiched between ITO/PEDOT and Ba/Ag electrodes. The emissive dipoles are located in an infinitely thin layer located at different positions within the EML; the numbers next to the spectra indicate the distance from the anode. Spectra are vertically displaced for clarity. (c) Measured EL spectrum of an OLED with the same structure (squares). A linear superposition of the spectra shown in (b) weighted such that the best match to the experimental spectrum was obtained (solid line). The measured EL spectrum of a B2 based OLED is also shown (circles). The solid line is a weighted superposition of simulated EL spectra for this OLED.

Image of FIG. 2.

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FIG. 2.

PEZ in the 90 nm thick EML of OLEDs with the following layer sequence: ITO/PEDOT/B1/Ba/Ag (◼), ITO/PEDOT/B2/Ba/Ag (●), and ITO/PEDOT/OTPD/B2/Ba/Ag (○). The solid lines are guides to the eyes.

Image of FIG. 3.

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FIG. 3.

Peak efficiency of B1 OLEDs with EML thicknesses between 40 and 300 nm. The EML was sandwiched between a Ba/Ag top and a ITO/PEDOT:PSS/OTPD bottom contacts. The numbers next to the data points indicate the CIE coordinates for the respective device. Inset: CIE coordinates of all devices; numbers denote the thickness of the EML in nanometers.

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/content/aip/journal/apl/94/26/10.1063/1.3159836
2009-06-30
2014-04-20

Abstract

The profile of the emission zone (PEZ) in the emissive layer (EML) of polymericorganic light-emitting diodes(OLEDs) is determined by fitting the measured electroluminescencespectrum of the device with a series of simulated spectra that correspond to different emitter locations. The studied OLEDs are based on two different blue-emitting conjugated polymers. In one case, the PEZ is confined to a 10 nm thin sheet at the anode indicating electron dominated current in the EML. In OLEDs based on the other emitter, the PEZ spreads over the entire EML.

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Scitation: Measuring the profile of the emission zone in polymeric organic light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/26/10.1063/1.3159836
10.1063/1.3159836
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