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Highly efficient pure white polymer light-emitting devices based on poly(N-vinylcarbazole) doped with blue and red phosphorescent dyes

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Abstract

Efficient white-polymer-light-emitting devices (WPLEDs) have been fabricated with a single emitting layer containing a hole-transporting host polymer, poly(N-vinylcarbzole), and an electron-transporting auxiliary, 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]-phenylene, codoped with two phosphorescent dyes: Iridium(III)bis (2-(4,6-difluorophenyl)-pyridinato-N,C2′) picolinate (FIrpic) and home-made Ir-G2 for blue and red emission, respectively. With the structure of ITO/PEDOT:PSS 4083(40 nm)/emission layer(80 nm)/Ba(4 nm)/Al(120 nm), the device showed a maximal luminous efficiency (LE) of 13.5 cd A−1(corresponding to an external quantum efficiency (EQE) of 6.8%), and a peak power efficiency (PE) of 6.5 lm W−1 at 6.0 V. Meanwhile, the device exhibited pure white emission with Commission Internationale de l’Eclairage (CIE) coordinates of (0.34, 0.35) at a current density of 12 mA cm−2, which is very close to the equi-energy white point with CIE coordinates of (0.33, 0.33). The device performance can be further optimized when more balanced hole/electron injection is achieved by incorporating a lower conducting type anode buffer layer (PEDOT:PSS) and incorporating poly[(9,9-bis(3′-(N,N-dimethylamino) propyl)-2,7-fluorenene)-alt-2,7-(9,9-dioctyfluorene)] (PFN) as an electron injection layer at the cathode. The optimized device showed an LE of 24.6 cd A−1 (with an EQE of 14.1%), while the peak power efficiency reached 12.66 lm W−1. Moreover, the WPLEDs showed good electroluminescence (EL) stability over a wide range of operating current density and luminance.

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Authors and Affiliations

  1. Key Laboratory of Specially Functional Materials, Ministry of Education; Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, 510640, China

    SuJun Hu, JianHua Zou, DongYun Li, HongBin Wu, ShiJian Su, Wei Yang, JunBiao Peng & Yong Cao

  2. Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, China

    GuiJiang Zhou & Wai-Yeung Wong

  3. Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Chemistry, Faculty of Science, Xi’an Jiaotong University, Xi’an, 710049, China

    GuiJiang Zhou

Authors
  1. SuJun Hu
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  2. JianHua Zou
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  3. GuiJiang Zhou
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  4. DongYun Li
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  5. HongBin Wu
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  6. ShiJian Su
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  7. Wai-Yeung Wong
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  8. Wei Yang
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  9. JunBiao Peng
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  10. Yong Cao
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Corresponding authors

Correspondence to HongBin Wu or Wai-Yeung Wong.

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Hu, S., Zou, J., Zhou, G. et al. Highly efficient pure white polymer light-emitting devices based on poly(N-vinylcarbazole) doped with blue and red phosphorescent dyes. Sci. China Chem. 54, 671–677 (2011). https://doi.org/10.1007/s11426-011-4228-8

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  • DOI: https://doi.org/10.1007/s11426-011-4228-8

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