Yutong Hu , Qin Zhang , Shiyan Guo , Zetian Huang , Wei Shi , Haitao Zhou , Jinhai Huang , Bin Wei , Zhiyun Zhang
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引用次数: 0
Abstract
The present study delineates the design and synthesis of two bipolar host materials, namely 4-(7-(9-([1,1′-biphenyl]-4-yl)-9H-carbazol-3-yl)-9,9-dimethyl-9H-fluoren-2-yl)benzonitrile (o-CzDFBN) and 4-(7-(9-([1,1′-biphenyl]-3-yl)-9H-carbazol-3-yl)-9,9-dimethyl-9H-fluoren-2-yl)benzonitrile (p-CzDFBN). By incorporating 9,9-dimethylfluorene as a π conjugated bridge, the fluorescence quantum yield, carrier mobility and balance can be improved. Both host materials have excellent thermal stability, with thermal decomposition temperature (Td) of exceeding 390 °C and glass transition temperature (Tg) of exceeding 125 °C. Electroluminescent devices using p-CzDFBN as the host material show better performance than those based on o-CzDFBN. The maximum external quantum efficiencyof red PhOLED reaches 27.17%. The non-doped blue OLED achieves a EQEmax of 6.38%, a maximum luminance (Lmax) of 20150 cd/m2, a maximum current efficiency of 4.81 cd/A, and a maximum power efficiency of 5.40 lm/W. This research contributes to the development of new materials for OLEDs, potentially leading to more efficient, stable, and high-performing OLEDs.
期刊介绍:
Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied.
Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media.
The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.