23 September 2016 Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer
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Abstract
In this study, the efficiency of organic light-emitting diodes (OLEDs) was enhanced by depositing a CeF3 film as an ultra-thin buffer layer between the ITO and NPB hole transport layer, with the structure configuration ITO/CeF3 (1 nm)/NPB (40 nm)/Alq3 (60 nm)/LiF (1 nm)/Al (150 nm). The enhancement mechanism was systematically investigated via several approaches. The work function increased from 4.8 eV (standard ITO electrode) to 5.2 eV (1-nm-thick UV-ozone treated CeF3 film deposited on the ITO electrode). The turn-on voltage decreased from 4.2 V to 4.0 V at 1 mA/cm2, the luminance increased from 7588 cd/m2 to 10820 cd/m2, and the current efficiency increased from 3.2 cd/A to 3.5 cd/A when the 1-nm-thick UV-ozone treated CeF3 film was inserted into the OLEDs.
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Hsin-Wei Lu, Po-Ching Kao, Sheng-Yuan Chu, "Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer", Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994124 (23 September 2016); doi: 10.1117/12.2237242; https://doi.org/10.1117/12.2237242
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