Citation: Li Bowen, Song Xiang'an, Jiang Xi, Li Zhiyi, Guo Fengyun, Wang Ying, Zhao Liancheng, Zhang Yong. Stable deep blue organic light emitting diodes with CIE of y < 0.10 based on quinazoline and carbazole units[J]. Chinese Chemical Letters, ;2020, 31(5): 1188-1192. doi: 10.1016/j.cclet.2019.06.033 shu

Stable deep blue organic light emitting diodes with CIE of y < 0.10 based on quinazoline and carbazole units

Li Bowen ^a ,
Song Xiang'an ^a ,
Jiang Xi ^a ,
Li Zhiyi ^b ,
Guo Fengyun ^a ,
Wang Ying ^b,**, ,
Zhao Liancheng ^a ,
Zhang Yong ^a,c,*,

a.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
b.
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
c.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

wangy@mail.ipc.ac.cn

yongzhang@hit.edu.cn

Received Date: 19 April 2019
Revised Date: 30 May 2019
Accepted Date: 18 June 2019
Available Online: 18 June 2019

Figures(5)

Achieving stable deep blue organic light emitting diodes (OLEDs) with narrow full width at half maximum (FWHM) and color gamut in the range of the commission International de L'Eclairage (CIE) of y ≤ 0.10 is still challenging in display and lighting applications. In this investigation, three donor-acceptor (D-A) deep-blue emitters were designed and synthesized via integrating asymmetric quinazoline (PQ) acceptor with weak donating carbazole (Cz) donor. The effect of the position and number of Cz group in PQ unit are investigated, which is also first examples for systematic research about the effect of different position of asymmetric PQ as acceptor on deep OLEDs. Their bandgaps of 3.12~3.19 eV and the singlet state energy levels of 3.12~3.19 eV were found to be sufficiently large to achieve deep blue light. As expected, these emitters-based OLEDs exhibit deep blue emission with the maximum wavelength ≤ 450 nm and narrow FWHM ≈ 60 nm. Especially, a CIE of y=0.080 was achieved for 4PQ-Cz-based OLED. Significantly, the deep blue electroluminescence (EL) spectra of these three emitters-based OLEDs are very stable and the corresponding CIE coordinates deviation △CIE (x, y)) can be negligible under the applied voltage ranging from 5 V to 9 V.
- Organic light-emitting diodes,
- Deep blue emitter,
- Quinazoline,
- Carbazole,
- Electroluminescence
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