TY - JOUR
T1 - Achieving High-Performance Solution-Processed Orange OLEDs with the Phosphorescent Cyclometalated Trinuclear Pt(II) Complex
AU - Yang, Xiaolong
AU - Jiao, Bo
AU - Dang, Jing Shuang
AU - Sun, Yuanhui
AU - Wu, Yong
AU - Zhou, Guijiang
AU - Wong, Wai Yeung
N1 - Funding Information:
The authors acknowledge the financial support received from the National Natural Science Foundation of China (nos. 21602170 and 21572176), the Natural Science Foundation of Shaanxi Province (no. 2016JQ2011), the China Postdoctoral Science Foundation (no. 2015M580831), the Fundamental Research Funds for the Central Universities (nos. cxtd2015003 and xjj2016061), and Creative Scientific Research Team in Yulin City.
Publisher copyright:
© 2018 American Chemical Society
PY - 2018/3/28
Y1 - 2018/3/28
N2 - Cyclometalated Pt(II) complexes can show intense phosphorescence at room temperature. Their emission properties are determined by both the organic ligand and the metal center. Whereas most of the related studies focus on tuning the properties by designing different types of organic ligands, only several reports investigate the key role played by the metal center. To address this issue, phosphorescent Pt(II) complexes with one, two, and three Pt(II) centers are designed and synthesized. With more Pt(II) centers, the cyclometalated multinuclear Pt(II) complexes display red-shifted emissions with increased photoluminescence quantum yields. Most importantly, solution-processed organic light-emitting diodes (OLEDs) with the conventional device structure using the multinuclear Pt(II) complexes as emitters show excellent performance. The controlled device based on the conventional mononuclear Pt(II) complex shows a peak external quantum efficiency, current efficiency, and power efficiency of 6.4%, 14.4 cd A-1, and 12.1 lm W-1, respectively. The efficiencies are dramatically improved to 10.5%, 21.4 cd A-1, and 12.9 lm W-1 for the OLED based on the dinuclear Pt(II) complex and to 17.0%, 35.4 cd A-1, and 27.2 lm W-1 for the OLED based on the trinuclear Pt(II) complex, respectively. To the best of our knowledge, these efficiencies are among the highest ever reported for the multinuclear Pt(II) complex-based OLEDs.
AB - Cyclometalated Pt(II) complexes can show intense phosphorescence at room temperature. Their emission properties are determined by both the organic ligand and the metal center. Whereas most of the related studies focus on tuning the properties by designing different types of organic ligands, only several reports investigate the key role played by the metal center. To address this issue, phosphorescent Pt(II) complexes with one, two, and three Pt(II) centers are designed and synthesized. With more Pt(II) centers, the cyclometalated multinuclear Pt(II) complexes display red-shifted emissions with increased photoluminescence quantum yields. Most importantly, solution-processed organic light-emitting diodes (OLEDs) with the conventional device structure using the multinuclear Pt(II) complexes as emitters show excellent performance. The controlled device based on the conventional mononuclear Pt(II) complex shows a peak external quantum efficiency, current efficiency, and power efficiency of 6.4%, 14.4 cd A-1, and 12.1 lm W-1, respectively. The efficiencies are dramatically improved to 10.5%, 21.4 cd A-1, and 12.9 lm W-1 for the OLED based on the dinuclear Pt(II) complex and to 17.0%, 35.4 cd A-1, and 27.2 lm W-1 for the OLED based on the trinuclear Pt(II) complex, respectively. To the best of our knowledge, these efficiencies are among the highest ever reported for the multinuclear Pt(II) complex-based OLEDs.
KW - efficiency
KW - organic light-emitting diodes
KW - phosphorescence
KW - trinuclear Pt(II) complex
KW - triphenylamine
UR - http://www.scopus.com/inward/record.url?scp=85044663925&partnerID=8YFLogxK
U2 - 10.1021/acsami.7b18330
DO - 10.1021/acsami.7b18330
M3 - Journal article
C2 - 29504742
AN - SCOPUS:85044663925
SN - 1944-8244
VL - 10
SP - 10227
EP - 10235
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 12
ER -