Novel and Efficient electroluminescent organo-iridium phosphorescent OLED materials
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Novel and Efficient electroluminescent organo-iridium phosphorescent OLED materials Heh-Lung Huang, Kou-Hui Shen, Miao-Cai Jhu, Mei-Rurng Tseng and Jia-Ming Liu* Division of Organo-electronic Materials, Materials Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan 310 E-mail: [email protected] ABSTRACT We investigated and synthesized different orientation and substituted group of the thieno-pyridine framework organo-iridium complexes (PO-01, PO-02, PO-03). These materials exhibited yellow light. Fabrication of these emissive phosphorescent dopants with the device configuration of ITO/ NPB/ CBP: Ir-complex (4-6%) /BCP/Alq3/LiF/Al showed the EL emitting peak from 532nm to 564nm. The electroluminescent efficiencies of the devices were from 9.62 lm/W to 30.41 lm/W and maximum brightness was all above 7000 cd/m2. We demonstrated high-efficiency, high-brightness and saturated yellow Ir-complex phosphorescent materials for OLED. INTRODUCTION Since Tang and VanSlyke reported the first configuration of the double-layered organic light electroluminescent (EL) device1, many research scientists have investigated and reported high performance organic EL devices. Organic EL materials have recently attracted much interest due to their different physical properties and potential applications in light emitting devices (LED) and flat panel displays. To realize full color display applications utilizing organic electroluminescent devices, the three elemental colors of red, green, and blue emitters with sufficiently high luminous efficiency and color purity are necessary. There is also a great demand for emitters that give a bright and high efficient color, such as yellow, orange or light blue color, for multicolor display usage. Among the recent EL materials, transition organo-metallic complexes hold more concerns than the organic dyes due to their phosphorescent emission. OLEDs based on phosphorescent materials can significantly improve electroluminescent performance because strong spin orbital coupling induces an interchange between singlet and triplet states that strengthens phosphorescence. Theoretically, the upper limit of inner quantum efficiency for phosphors can reach 100%, which is four times
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higher than that of the devices using other fluorescent materials. Moreover, the power consumption of full color EL devices by using only red phosphorescent OLED materials can reduce up to 42% than using organic fluorescent dyes as an emitter. The first reported phosphorescent red OLED material was Eu(DBM)3(Phen) 2. In 1994, Kido, J. et al. reported triple-layer-type cells with the structure of a glass substrate/indium-tin oxide/triphenyl diamine derivative (TPD)/Eu complex: 1,3,4-oxadiazole derivative (PBD)/aluminum complex (Alq3)/Mg: Ag exhib
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