Zheng, Xinyou
(School of Material Science and Egineering,Shanghai University)
,
Wu, Youzhi
(School of Material Science and Egineering,Shanghai University)
,
Zhu, Weiqing
(School of Material Science and Egineering,Shanghai University)
,
Jiang, Xuyin
(School of Material Science and Egineering,Shanghai University)
,
Zhang, Zhilin
(School of Material Science and Egineering,Shanghai University)
,
Xu, Shaohong
(School of Material Science and Egineering,Shanghai University)
Organic electroluminescent (OEL) materials have recently attracted much interest due to their intriguing physical properties and potential applications to flat panel display. Blue EL emitter is essential for the development of a full-color display based either on the "color changing medium" technolo...
Organic electroluminescent (OEL) materials have recently attracted much interest due to their intriguing physical properties and potential applications to flat panel display. Blue EL emitter is essential for the development of a full-color display based either on the "color changing medium" technology or the RGB filtered white emission. Many blue organic EL materials have been investigated by a number of researchers. Among them, the most promising ones are DSA derivatives. These classes of compounds generally offer many attractive properties such as high thermal stability and good film forming ability, etc.In this paper, the DSA derivative blue emitting material 4,4'-bis(2, 2-diphenylvinyl)-l, I'-biphenyl, i.e., DPVBi is synthesized via the Wittig-Horner reaction, and determined by IR, 'H-NMR and elementary analysis. The photoluminescence (PL) of this compound in solid film and EL have been studied. DPVBi is intense blue fluorescent material and have a good film forming ability. The excitation and emission spectra of the vacuum deposited film of DPVBi have been studied. The emission spectrum shows the emission lies in the blue region with a peak at 460nm under the excitation of 360nm light.A blue organic light emitting diode(OLED) with the structure ITO/CuPc/NPB/DPVBi/Alq3/LiF/Al is studied. The EL spectrum of the device is similar to the PL spectrum of single layer DPVBi, indicating that the emission from the device resulted from the same excited state of the DSA derivative. The CIE chromaticity coordinates of the device are j- =0.15, y = 0.16, showing a very good blue purity. For the blue device, maximum luminance, the luminance under current density of 20mA/cm2 and luminous efficiency are 4 373cd/m2, 434cd/m2 and 1.24 Im/W, respectively. Particularly, it can be found that the CIE chromaticity coordinates of the device can keep better stability all the time with increasing current density as well as showing a very good blue purity. Because the stability of chromaticity is one of the most important factors to practical application of OLEDs, and DPVBi is a stable blue light emitter, it is suitable for applications to flat panel display.
Organic electroluminescent (OEL) materials have recently attracted much interest due to their intriguing physical properties and potential applications to flat panel display. Blue EL emitter is essential for the development of a full-color display based either on the "color changing medium" technology or the RGB filtered white emission. Many blue organic EL materials have been investigated by a number of researchers. Among them, the most promising ones are DSA derivatives. These classes of compounds generally offer many attractive properties such as high thermal stability and good film forming ability, etc.In this paper, the DSA derivative blue emitting material 4,4'-bis(2, 2-diphenylvinyl)-l, I'-biphenyl, i.e., DPVBi is synthesized via the Wittig-Horner reaction, and determined by IR, 'H-NMR and elementary analysis. The photoluminescence (PL) of this compound in solid film and EL have been studied. DPVBi is intense blue fluorescent material and have a good film forming ability. The excitation and emission spectra of the vacuum deposited film of DPVBi have been studied. The emission spectrum shows the emission lies in the blue region with a peak at 460nm under the excitation of 360nm light.A blue organic light emitting diode(OLED) with the structure ITO/CuPc/NPB/DPVBi/Alq3/LiF/Al is studied. The EL spectrum of the device is similar to the PL spectrum of single layer DPVBi, indicating that the emission from the device resulted from the same excited state of the DSA derivative. The CIE chromaticity coordinates of the device are j- =0.15, y = 0.16, showing a very good blue purity. For the blue device, maximum luminance, the luminance under current density of 20mA/cm2 and luminous efficiency are 4 373cd/m2, 434cd/m2 and 1.24 Im/W, respectively. Particularly, it can be found that the CIE chromaticity coordinates of the device can keep better stability all the time with increasing current density as well as showing a very good blue purity. Because the stability of chromaticity is one of the most important factors to practical application of OLEDs, and DPVBi is a stable blue light emitter, it is suitable for applications to flat panel display.
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