DOI QR코드

DOI QR Code

Fabrication of White OLED Using Zn(HPB)2 and Zn(HPQ)2 as a emitting layer

Zn(HPB)2와 Zn(HPQ)2를 이용한 White OLED의 제작 및 전기적 특성

  • Received : 2010.11.17
  • Accepted : 2010.11.27
  • Published : 2010.12.01

Abstract

We have studied white OLED using two types of Zn-complexes as a emitting layer. We synthesized new emissive materials $Zn(HPQ)_2$ as a yellow emitting material and $Zn(HPB)_2$ as a blue emitting material. Zn-complexes have a low molecular compound and thermal stability. The fundamental structures of the fabricated OLED was ITO / NPB (40nm) / $Zn(HPB)_2$ (30nm) / $Zn(HPQ)_2$ / LiF / Al. We varied the thickness of the $Zn(HPQ)_2$ layer 20, 30 40 nm. When the thickness of the $Zn(HPQ)_2$ layer was 20 nm, white emission was achieved. The maximum luminance was 12,000 cd/$m^2$ at a current density of 800 mA/$cm^2$. The CIE coordinates of the white emission was (0.319. 0.338) at an applied voltage of 10 V.

Keywords

References

  1. C. W. Tang and S. A. VanSlyke, "Organic electroluminescent diodes", Appl. Phys. Lett., Vol. 51 pp. 913-915, 1987 https://doi.org/10.1063/1.98799
  2. L. S. Liao, K. P. Klubek, and C. W. Tang, "High-efficiency tandem organic light-emitting diodes", Appl. Phys. Letts, Vol. 84, pp.167-169, 2004. https://doi.org/10.1063/1.1638624
  3. J. Kido, K. Hongawa, K. Okuyama and K. Nagai, "White light-emitting organic electroluminescent devices using the poly(N-vinylcarbazole) emitter llayer doped with three fluorescent dyes" Appl. Phys. Letts. Vol. 64, pp. 815-817, 1994 https://doi.org/10.1063/1.111023
  4. Yao-Shan Wu, Shiao-Wen Hwang, Hsian-Hung Chen, Meng-Ting Lee, Wen-Jian Shen, and Chin H. Chen, "Efficient white organic light emitting devices with dual emitting layers", Thin Solid Films Vol. 488 pp.265-269, 2005 https://doi.org/10.1016/j.tsf.2005.04.032
  5. Brian W. D'Andrade, Russell J. Holmes, and Stephen R. Forrest "Efficient Organic Electrophosphorescent White-Light-Emitting Devices with a Triple Doped Emissive layer", Avd. Mater., Vol. 16 , pp. 623-628, 2004
  6. Marco Mazzeoa, Dario Pisignano, Laura Favaretto, Giovanna Sotgiu, Giovanna Barbarella, Roberto Cingolani and Giuseppe Gigl, "White emission from organic light emitting diodes based on energy down-convertion mechanisms", Synthetic Metals Vol. 139, pp.675-677, 2003 https://doi.org/10.1016/S0379-6779(03)00306-0