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Chin. Phys. B, 2015, Vol. 24(5): 057802    DOI: 10.1088/1674-1056/24/5/057802
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

High color rendering index white organic light-emitting diode using levofloxacin as blue emitter

Miao Yan-Qin (苗艳勤)a c, Gao Zhi-Xiang (高志翔)b, Zhang Ai-Qin (张爱琴)a c, Li Yuan-Hao (李源浩)a c, Wang Hua (王华)a c, Jia Hu-Sheng (贾虎生)a d, Liu Xu-Guang (刘旭光)a e, Tsuboi Taijuf
a Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China;
b School of Physical Science and Electronics, Shanxi Datong University, Datong 037009, China;
c Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
d College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
e College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
f Institute of Advanced Materials, Nanjing University of Technology, Nanjing 210009, China
Abstract  

Levofloxacin (LOFX), which is well-known as an antibiotic medicament, was shown to be useful as a 452-nm blue emitter for white organic light-emitting diodes (OLEDs). In this paper, the fabricated white OLED contains a 452-nm blue emitting layer (thickness of 30 nm) with 1 wt% LOFX doped in CBP (4,4'-bis(carbazol-9-yl)biphenyl) host and a 584-nm orange emitting layer (thickness of 10 nm) with 0.8 wt% DCJTB (4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran) doped in CBP, which are separated by a 20-nm-thick buffer layer of TPBi (2,2',2"-(benzene-1,3,5-triyl)-tri(1-phenyl-1H-benzimidazole). A high color rendering index (CRI) of 84.5 and CIE chromaticity coordinates of (0.33, 0.32), which is close to ideal white emission CIE (0.333, 0.333), are obtained at a bias voltage of 14 V. Taking into account that LOFX is less expensive and the synthesis and purification technologies of LOFX are mature, these results indicate that blue fluorescence emitting LOFX is useful for applications to white OLEDs although the maximum current efficiency and luminance are not high. The present paper is expected to become a milestone to using medical drug materials for OLEDs.

Keywords:  levofloxacin      blue organic light emitting diodes      white organic light-emitting diodes      high color rendering index  
Received:  18 October 2014      Revised:  18 December 2014      Accepted manuscript online: 
PACS:  78.60.Fi (Electroluminescence)  
  72.80.Le (Polymers; organic compounds (including organic semiconductors))  
Fund: 

Project supported by the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-13-0927), the International Science & Technology Cooperation Program of China (Grant No. 2012DFR50460), the National Natural Science Foundation of China (Grant Nos. 21101111 and 61274056), and the Shanxi Provincial Key Innovative Research Team in Science and Technology, China (Grant No. 2012041011).

Corresponding Authors:  Wang Hua, Jia Hu-Sheng     E-mail:  wanghua001@tyut.edu.cn;jia husheng@126.com
About author:  78.60.Fi; 72.80.Le

Cite this article: 

Miao Yan-Qin (苗艳勤), Gao Zhi-Xiang (高志翔), Zhang Ai-Qin (张爱琴), Li Yuan-Hao (李源浩), Wang Hua (王华), Jia Hu-Sheng (贾虎生), Liu Xu-Guang (刘旭光), Tsuboi Taiju High color rendering index white organic light-emitting diode using levofloxacin as blue emitter 2015 Chin. Phys. B 24 057802

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