Charge Carrier Transporting, Photoluminescent, and Electroluminescent Properties of Zinc(II)-2-(2-hydroxyphenyl)benzothiazolate Complex

详细信息    查看全文

• 作者：Xinjun Xu ; Yi Liao ; Gui Yu ; Han You ; Chong'an Di ; Zhongmin Su ; Dongge Ma ; Qian Wang ; Shayu Li ; Shuangqing Wang ; Jianping Ye ; Yunqi Liu
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：April 3, 2007
• 年：2007
• 卷：19
• 期：7
• 页码：1740 - 1748
• 全文大小：275K
• 年卷期：v.19,no.7(April 3, 2007)
• ISSN：1520-5002

文摘

Zinc(II)-2-(2-hydroxyphenyl)benzothiazolate complex is an excellent white-light-emitting material.Despite some studies devoted to this complex, no information on the real origin of the unusually broadelectroluminescent (EL) emission is available. Therefore, we investigate photoluminescent and ELproperties of the zinc complex. Orange phosphorescent emission at 580 nm was observed for the complexin thin film at 77 K, whereas only fluorescent emission was obtained at room temperature. Molecularorbitals, excitation energy, and emission energy of the complex were investigated using quantum chemicalcalculations. We fabricated the device with a structure of ITO/F₁₆CuPc(5.5 nm)/Zn-complex/Al, whereF₁₆CuPc is hexadecafluoro copper phthalocyanine. The EL spectra varied strongly with the thickness ofthe emissive layer. We observed a significant change in the emission spectra with the viewing angles.Optical interference effects and light emission originating both from fluorescence and from phosphorescence can explain all of the observed phenomena, resulting in the broad light emission for the devicesbased on the Zn complex. We calculated the charge transfer integral and the reorganization energy toexplain why the Zn complex is a better electron transporter than a hole transporter.