中国物理B ›› 2012, Vol. 21 ›› Issue (5): 58503-058503.doi: 10.1088/1674-1056/21/5/058503

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p–n heterojunctions

苏跃举1 2 3,吴晓明1 2 3,华玉林1 2 3,申利莹1 2 3,焦志强1 2 3,董木森1 2 3,印寿根1 2 3   

  1. 1. School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China;
    2. Key Laboratory of Display Materials & Photoelectric Devices of Ministry of Education, Tianjin University of Technology, Tianjin 300384, China;
    3. Tianjin Key Laboratory for Photoelectric Materials & Devices, Tianjin University of Technology, Tianjin 300384, China
  • 收稿日期:2011-09-14 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022 and 60876046) and the Tianjin Natural Science Foundation, China (Grant No. 10JCYBJC01100).

Highly efficient blue fluorescent OLEDs with doped double emitting layers based on p–n heterojunctions

Su Yue-Ju(苏跃举)a)b)c), Wu Xiao-Ming(吴晓明)a)b)c), Hua Yu-Lin(华玉林)a)b)c)†, Shen Li-Ying(申利莹)a)b)c), Jiao Zhi-Qiang(焦志强) a)b)c), Dong Mu-Sen(董木森)a)b)c), and Yin Shou-Gen(印寿根)a)b)c)   

  1. 1. School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China;
    2. Key Laboratory of Display Materials & Photoelectric Devices of Ministry of Education, Tianjin University of Technology, Tianjin 300384, China;
    3. Tianjin Key Laboratory for Photoelectric Materials & Devices, Tianjin University of Technology, Tianjin 300384, China
  • Received:2011-09-14 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022 and 60876046) and the Tianjin Natural Science Foundation, China (Grant No. 10JCYBJC01100).

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摘要： We fabricate a kind of novel efficient blue fluorescent organic light emitting device (OLED) based on p--n heterojunctions composed of hole transporting layer (HTL) N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB) and electron transporting layer (ETL) 4,7-diphnenyl-1,10-phenanthroline (BPhen), into which a new blue material, DNCA (a derivation of N6, N6, N12, N12-tetrap-tolylchrysene-6,12-diamine), is partially doped simultaneously, and double emitting layers are configured. With a turn-on voltage of 2.6 V at 1 cd/m2, this type of OLED presents a maximum luminance efficiency (ηmax) of 8.83 cd/A at 5.818 mA/cm2 and a maximum luminance of over 40000 cd/m2. Meanwhile, the Commission Internationale De L'Eclairage (CIE) coordinates of this device change slightly from (0.13, 0.27) to (0.13, 0.23) as the driving voltage increases from 3 V to 11 V. This improvement in the electroluminescent characteristics is attributed mainly to the ideal p--n heterojunction which can confine and distribute excitons evenly on two sides of the heterojunction interface so as to improve the carrier combination rate and expand the light-emitting region.

关键词: heterojunction, organic light-emitting diodes, exciplex emission, double emitting layers

Abstract: We fabricate a kind of novel efficient blue fluorescent organic light emitting device (OLED) based on p--n heterojunctions composed of hole transporting layer (HTL) $N$,$N^\prime$-bis(naphthalen-1-yl)-$N$,$N^\prime$-bis(phenyl)-benzidine (NPB) and electron transporting layer (ETL) 4,7-diphnenyl-1,10-phenanthroline (BPhen), into which a new blue material, DNCA (a derivation of N6, N6, N12, N12-tetrap-tolylchrysene-6,12-diamine), is partially doped simultaneously, and double emitting layers are configured. With a turn-on voltage of 2.6 V at 1 cd/m2, this type of OLED presents a maximum luminance efficiency (ηmax) of 8.83 cd/A at 5.818 mA/cm2 and a maximum luminance of over 40000 cd/m2. Meanwhile, the Commission Internationale De L'Eclairage (CIE) coordinates of this device change slightly from (0.13, 0.27) to (0.13, 0.23) as the driving voltage increases from 3 V to 11 V. This improvement in the electroluminescent characteristics is attributed mainly to the ideal p--n heterojunction which can confine and distribute excitons evenly on two sides of the heterojunction interface so as to improve the carrier combination rate and expand the light-emitting region.

Key words: heterojunction, organic light-emitting diodes, exciplex emission, double emitting layers

中图分类号:  (Optoelectronic device characterization, design, and modeling)

  • 85.60.Bt
85.60.Jb (Light-emitting devices) 78.60.Fi (Electroluminescence)