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Carrier trapping and efficient recombination of electrophosphorescent device with stepwise doping profile
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10.1063/1.1894596
/content/aip/journal/apl/86/13/10.1063/1.1894596
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/13/10.1063/1.1894596
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Configuration of phosphorescent OLED device with stepwise-doping profile in emitting layer (a) thick EML subregion adjacent to HTL∕EML interface was doped with 10%, followed by with 7% doping, and 4% at adjacent to EML∕BL interface (b) reversed sequence of doping concentration, 4%, 7%, and 10% from HTL∕EML interface.

Image of FIG. 2.
FIG. 2.

Comparison of device characteristics: Luminance-voltage characteristics and power efficiency (lm∕W) for homogeneous and stepwise profile of doping ratio: (a) CBP: green devices and (b) CBP: red devices.

Image of FIG. 3.
FIG. 3.

Relative position of HOMO and LUMO levels for the materials used for OLED fabrication. Using the evaporated thin films ( thickness each) onto ITO glasses, energies are measured by Riken–Keiki AC-2 and from lower-energy threshold of the electronic absorption spectra.

Image of FIG. 4.
FIG. 4.

Dependence of current density on voltage for various doping concentrations of electrophosphorescent devices (a) CBP: green devices and (b) CBP: red devices.

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/content/aip/journal/apl/86/13/10.1063/1.1894596
2005-03-22
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Carrier trapping and efficient recombination of electrophosphorescent device with stepwise doping profile
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/13/10.1063/1.1894596
10.1063/1.1894596
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