Enhanced carrier balance by organic salt doping in single-layer polymer light-emitting devices |
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Authors: | Dong-Hyun Lee Jong Hyeok Park Heeyeop Chae Sung M Cho |
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Affiliation: | aDepartment of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea;bAdvanced Materials and Process Research Center for IT, Sungkyunkwan University, Suwon 440-746, Republic of Korea |
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Abstract: | We have showed that the doping of an organic salt into a PVK-based polymer emissive layer could enhance the carrier balance greatly to result in higher luminance and luminous efficiency. It is found out that the salt-doped devices show the similar operating characteristics of frozen-junction light-emitting electrochemical cells (LECs). With the salt doping of 0.6 wt.% and an appropriate salt activation process, the fabricated PVK-based polymer light-emitting diodes (PLEDs) shows the luminous efficiency of 15 cd/A at the highest luminance of 55,000 cd/m2 even without an electron-injecting LiF layer. Due to the enhanced carrier balance, the luminous efficiency is found to be maintained from the turn-on voltage to the voltage for the maximum luminance, which means a linear relationship between luminance and current density. |
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Keywords: | Polymer light-emitting diodes Organic salt Light-emitting electrochemical cells Carrier balance |
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