TY - JOUR
T1 - Thermally stable bipolar host materials for high efficiency phosphorescent green and blue organic light-emitting diodes
AU - Dong, Qingchen
AU - Tai, Feifei
AU - Lian, Hong
AU - Chen, Zheng
AU - Hu, Mingming
AU - Huang, Jinhai
AU - WONG, Wai Yeung
N1 - Funding Information:
We acknowledge the financial support from the National Natural Science Foundation of China (Grant No.: 61307030, 21303117). This work was also supported by the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT), Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, the National Science Foundation for Young Scientists of Shanxi Province, China (Grant No.: 2014021019-2), the Outstanding Young Scholars Cultivating Program, Research Project Supported by Shanxi Scholarship Council of China (Grant No.: 2014-02) and the Key R&D Project of Shanxi Province (International cooperation program, No. 201603D421032). W. Y. Wong thanks for the financial support from the Hong Kong Polytechnic University.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - Two bipolar host materials H1 (N-linked carbazole) and H2 (C-3-linked carbazole) via changing the substitution position of triazine and carbazole moieties are reported. Their structural and physical properties were fully characterized. The thermal analysis demonstrated that both H1 and H2 are of high thermal stability. The triplet energy levels of H1 and H2 were determined to be 2.64 and 2.7 eV, respectively. Both green and blue OLEDs with H1 and H2 acting as host materials were fabricated to investigate their performances in PHOLED. The green PHOLED based on H1 exhibits the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 51.7 cd/A, 37.8 lm/W and 132800 cd/m2, respectively, while the blue PHOLED based on H2 shows the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 21.6 cd/A, 17.2 lm/W and 16640 cd/m2, respectively. The characteristic measurements of OLED devices reveal that both H1 and H2 are promising host materials for practical application. By comparing the commercial host materials of 4,4’-bis(carbazol-9-yl)biphenyl (CBP) and N,N-dicarbazoyl-3,5-benzene (mCP), the power efficiencies of green and blue PHOLED were boosted by 22.3% and 75.5%, respectively.
AB - Two bipolar host materials H1 (N-linked carbazole) and H2 (C-3-linked carbazole) via changing the substitution position of triazine and carbazole moieties are reported. Their structural and physical properties were fully characterized. The thermal analysis demonstrated that both H1 and H2 are of high thermal stability. The triplet energy levels of H1 and H2 were determined to be 2.64 and 2.7 eV, respectively. Both green and blue OLEDs with H1 and H2 acting as host materials were fabricated to investigate their performances in PHOLED. The green PHOLED based on H1 exhibits the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 51.7 cd/A, 37.8 lm/W and 132800 cd/m2, respectively, while the blue PHOLED based on H2 shows the best performance with the maximum current efficiency, maximum power efficiency and maximum brightness of 21.6 cd/A, 17.2 lm/W and 16640 cd/m2, respectively. The characteristic measurements of OLED devices reveal that both H1 and H2 are promising host materials for practical application. By comparing the commercial host materials of 4,4’-bis(carbazol-9-yl)biphenyl (CBP) and N,N-dicarbazoyl-3,5-benzene (mCP), the power efficiencies of green and blue PHOLED were boosted by 22.3% and 75.5%, respectively.
KW - Bipolar host materials
KW - Carbazole derivatives
KW - Phosphorescent organic light-emitting diodes
KW - Triazine derivatives
UR - http://www.scopus.com/inward/record.url?scp=85019079564&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2017.05.004
DO - 10.1016/j.dyepig.2017.05.004
M3 - Article
AN - SCOPUS:85019079564
SN - 0143-7208
VL - 143
SP - 470
EP - 478
JO - Dyes and Pigments
JF - Dyes and Pigments
ER -