Towards Color Stable Blue Primary for Displays: Suppress Field-Dependent Color Change in a Multilayered Electroluminescent Device

A blue fluorescent organic compound, 1-phenyl-3,4- dimethyl-1H-pyrazolo[3,4-b]quinoline (PAQ5), is a suitable emitter to enable a color stable blue emission from multilayered light emitting devices. The dopant PAQ5 functioned as an energy trap and an emitter having its HOMO/LUMO levels lying inside...

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Bibliographic Details
Published in:Journal of display technology 2011-02, Vol.7 (2), p.96-104
Main Authors: Linping Mu, Zhiqun He, Xiangfei Kong, Chunjun Liang, Yongsheng Wang, Danel, Andrzej, Kulig, Ewa, Milburn, G Harry W
Format: Article
Language:English
Subjects:
Absorption
Blue
Color
color measurement
Devices
display
Dopants
Electric fields
Electroluminescence
electroluminescent (EL) device
Emission
Emitters (electron)
Energy exchange
fluorescence spectroscopy
Green products
Luminance
Materials
organic dyes
Organic light emitting diodes
Performance evaluation
primary color
pyrazoloquinoline
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Summary:A blue fluorescent organic compound, 1-phenyl-3,4- dimethyl-1H-pyrazolo[3,4-b]quinoline (PAQ5), is a suitable emitter to enable a color stable blue emission from multilayered light emitting devices. The dopant PAQ5 functioned as an energy trap and an emitter having its HOMO/LUMO levels lying inside the band gap of the host to secure an efficient energy transfer; it also reduced barrier height for electron injection and improved electron transporting of the emitting layer. It lowered the turn-on electric field and enhanced luminance gradually as the dopant concentrations increased. A bright and color stable blue emission having CIE ( x , y ) = (0.168, 0.100) was obtained. Field-dependent color change of such multilayered devices within a wide range of driving electric fields was suppressed by PAQ5 dopant. A color purity of 0.815 was achieved.
ISSN:1551-319X
1558-9323
DOI:10.1109/JDT.2010.2096532