Realization of high-performance blue organic light-emitting diodes using multi-emissive layers |
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Authors: | Ju-An Yoon You-Hyun Kim Nam Ho Kim Chul Gyu Jhun Song Eun Lee Young Kwan Kim Fu Rong Zhu Woo Young Kim |
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Affiliation: | [1]Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan 330-713, South Korea [2]Department of Information Display, Hongik University, Seoul 121-791, South Korea [3]Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4L7, Canada [4]Department of Physics, Hong Kong Baptist University, Hong Kong, China |
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Abstract: | High-performance blue organic light-emitting diodes(OLEDs) are developed.A concept of using multiple-emissive layer(EML) configuration is adopted.In this letter,bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)Al(BAlq) and 9,10-di(naphtha-2-yl)anthracene(ADN),which serve n- and p-type EMLs,respectively,are used to evaluate and demonstrate the multi-EML concept for blue OLEDs.The thickness effect of individual EMLs and the number of EMLs,e.g.,triple and quadruple EML components,on the power efficiency of blue OLEDs are systematically investigated.To illustrate the point,the total thickness of the emissive region in different blue OLEDs are kept contact at 30 nm for comparison.The power efficiency of blue OLEDs with a quadruple EML structure of BAlq/ADN/BAlq/ADN is about 40% higher than that of blue OLEDs having a single EML unit.The Commission Internationale deL'eclairage color coordinates of multi-EML OLEDs have values that represent the average of blue emissions from individual EMLs of BAlq and ADN. |
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Keywords: | 230.0230 230.3670 230.0250 160.4890 130.5990 |
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