MoO<sub>3</sub> as a cathode buffer layer for enhancing the efficiency in white organic light-emitting diodes

Jing Zhang; Fang-hui Zhang; Lei Ding; Yan-fei Li; Tian-jing Liang

doi:10.1007/s11801-012-2241-6

Optoelectronics Letters ›› 2012, Vol. 8 ›› Issue (4) : 256-259. DOI: 10.1007/s11801-012-2241-6

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MoO₃ as a cathode buffer layer for enhancing the efficiency in white organic light-emitting diodes

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Abstract

Molybdenum trioxide (MoO₃) as a cathode buffer layer is inserted between LiF and Al to improve the efficiency of white organic light-emitting diodes (OLEDs) in this paper. By changing the MoO₃ thickness, a higher current efficiency of 5.79 cd/A is obtained at a current density of 160 mA/cm² for the device with a 0.8 nm-thick MoO3 layer as the cathode buffer layer, which is approximately two times greater than that of the device without MoO₃. The mechanism for improving the device efficiency is discussed. Moreover, at a voltage of 13 V, the device with a 0.8 nm-thick MoO₃ layer achieves a higher luminance of 22370 cd/m², and the Commission Internationale de I’Eclairage (CIE) color coordinate of the device with 1 nm-thick MoO₃ layer is (0.33, 0.34), which shows the best color purity. Simple electron-only devices are tested to confirm the impact of the MoO₃ layer on the carrier injection.

Keywords

Current Efficiency / Carrier Injection / Device Efficiency / Molybdenum Trioxide / High Current Efficiency

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Jing Zhang, Fang-hui Zhang, Lei Ding, Yan-fei Li, Tian-jing Liang. MoO₃ as a cathode buffer layer for enhancing the efficiency in white organic light-emitting diodes. Optoelectronics Letters, 2012, 8(4): 256‒259 https://doi.org/10.1007/s11801-012-2241-6

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This work has been supported by the National Natural Science Foundation of China (No.61076066), and the Doctor Foundation of Shaanxi University of Science and Technology (No.BJ09-07).