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Improving the color purity and efficiency of blue organic light-emitting diodes (BOLED) by adding hole-blocking layer |
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| Authors: | CJ Huang CC Kang TC Lee WR Chen TH Meen |
| Institution: | a Department of Applied Physics, National University of Kaohsiung, #700 Kaohsiung University Road, Nan-Tzu, Kaohsiung, Taiwan, ROC b Department of Electro-Optical Engineering, Southern Taiwan University of Technology, 1 Nan-Tai St., Yung-Kang City, Tainan, Taiwan, ROC c Department of Electrical Engineering, Southern Taiwan University of Technology, 1 Nan-Tai St., Yung-Kang City, Tainan, Taiwan, ROC d Department of Electronic Engineering, National Formosa University, #64 Wen-Hwa Road, Hu-Wei, Yunlin, Taiwan, ROC |
| Abstract: | This work demonstrates the fabrication of a bright blue organic light-emitting diode (BOLED) with good color purity using 4,4′-bis(2,2-diphenylvinyl)-1,1′-biphenyl (DPVBi) and bathocuproine (BCP) as the emitting layer (EML) and the hole-blocking layer (HBL), respectively. Devices were prepared by vacuum deposition on indium tin oxide (ITO)-glass substrates. The thickness of DPVBi used in the OLED has an important effect on color and efficiency. The blue luminescence is maximal at 7670 cd/m2 when 13 V is applied and the BCP thickness is 2 nm. The CIE coordinate at a luminance of 7670 cd/m2 is (0.165, 0.173). Furthermore, the current efficiency is maximum at 4.25 cd/A when 9 V is applied. |
| Keywords: | CIE coordinates Blue organic light-emitting diode (BOLED) Hole-blocking layer (HBL) |
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