Bifunctional Heterocyclic Spiro Derivatives for Organic Optoelectronic Devices.
A series of heterocyclic spiro derivatives has been successfully synthesized and characterized by photophysical and electrochemical studies. Taking advantage of their excellent hole-transporting properties, highly efficient small-molecular organic photovoltaic devices based on these heterocyclic compounds as donors with very low dopant concentrations have been prepared; particularly, a high open-circuit voltage of up to 1.10 V and a power conversion efficiency of up to 5.12% have been realized. In addition, most of these heterocyclic spiro derivatives are found to be highly emissive in solutions with photoluminescence quantum yields of up to 0.91, and high-performance deep-blue-emitting organic light-emitting diodes (OLEDs) have been achieved. Such devices exhibit a stable deep blue emission with CIE coordinates of (0.16, 0.04) and high external quantum efficiencies of up to 4.7%, which is one of the best values among the reported OLEDs with CIEy < 0.08.
Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong.
Chin-Yiu
CY
Chan
Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong.
Yi-Chun
YC
Wong
Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong.
Mei-Yee
MY
Chan
Department of Physics, Hong Kong Baptist University , Kowloon Tong, Hong Kong.
Sin-Hang
SH
Cheung
Department of Physics, Hong Kong Baptist University , Kowloon Tong, Hong Kong.
Shu-Kong
SK
So
Department of Chemistry, The University of Hong Kong , Pokfulam Road, Hong Kong.
Vivian Wing-Wah
VW
Yam
bifunctional materials; heterocyclic; organic light-emitting diodes; organic photovoltaics; spiro