4.5 Article

Color-stable, reduced efficiency roll-off hybrid white organic light emitting diodes with ultra high brightness

期刊

CHINESE PHYSICS B
卷 22, 期 7, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/22/7/077303

关键词

white light; color stability; efficiency roll-off; high brightness

资金

  1. National Basic Research Program of China [2009CB623604]
  2. National Natural Science Foundation of China [61204087, 51173049, U0634003, 61036007, 60937001]
  3. Fundamental Research Funds for the Central Universities, China [2011ZB0002, 2011ZM0009]
  4. China Postdoctoral Science Foundation

向作者/读者索取更多资源

High-brightness and color-stable two-wavelength hybrid white organic light emitting diodes (HWOLEDs) with the configuration of indium tin oxide (ITO)/ N, N, N', N'-tetrakis(4-methoxyphenyl)-benzidine (MeO-TPD): tetrafluoro-tetracyanoqino dimethane (F4-TCNQ)/N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB)/4,4-N,N-dicarbazolebiphenyl (CBP): iridium (III) diazine complexes (MPPZ)(2)Ir(acac)/NPB/2-methyl-9,10-di(2-naphthyl)anthracene (MADN): p-bis(p-N,N-di-phenyl-aminostyryl)benzene (DSA-ph)/ bis(10-hydroxybenzo[h] quinolinato)beryllium complex (Bebq(2))/LiF/Al have been fabricated and characterized. The optimal brightness of the device is 69932 cd/m(2) at a voltage of 13 V, and the Commission Internationale de l'Eclairage (CIE) chromaticity coordinates are almost constant during a large voltage change of 6-12 V. Furthermore, a current efficiency of 15.3 cd/A at an illumination-relevant brightness of 1000 cd/m(2) is obtained, which rolls off slightly to 13.0 cd/A at an ultra high brightness of 50000 cd/m(2). We attribute this great performance to wisely selecting an appropriate spacer together with effectively utilizing the combinations of exciton-harvested orange-phosphorescence/blue-fluorescence in the device. Undoubtedly, this is one of the most exciting results in two-wavelength HWOLEDs up to now.

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