Photovoltaic effects of rare earth organic electroluminescent devices(OELD), ITO/TPD/Gd(DBM) 3 bath, were described. Double OEL devices with Gd complex indicated considerable photovoltaic properties. About 20 μA·...Photovoltaic effects of rare earth organic electroluminescent devices(OELD), ITO/TPD/Gd(DBM) 3 bath, were described. Double OEL devices with Gd complex indicated considerable photovoltaic properties. About 20 μA·cm -2 of maximum short current ( I sc ) and 2 2 V of maximum voltage ( V oc ) of the photovolotaic cell with the rare earth complex under illumination UV lamp with 365 nm were achieved. Although the most sensitive response of it is at UV region, V oc larger than 1 5 V under solar illumination can also be observed. Under UV light illumination of 367 nm, V oc =844 mV, I sc =2 1 μA·cm -2 and 4% of energy transfer efficiency were measured.展开更多
Double-layer orgainc electroluminescent devices have been constructed. A new fluorescent dye, 9,10-bis(phenylethynyl)anthracence was chosen as the dopant which was molecularly dispersed in the polymer film, and green ...Double-layer orgainc electroluminescent devices have been constructed. A new fluorescent dye, 9,10-bis(phenylethynyl)anthracence was chosen as the dopant which was molecularly dispersed in the polymer film, and green light was observed from the device with luminance of 130cd/m2 at 17V.展开更多
By considering the interaction between Fowler-Nordheim tunneling injection theory and charge carriers transporting through the bulk, an electroluminescence model for organic single-layer diodes is presented. The expre...By considering the interaction between Fowler-Nordheim tunneling injection theory and charge carriers transporting through the bulk, an electroluminescence model for organic single-layer diodes is presented. The expressions of the recombination current density, recombination efficiency and conductivity of the diodes are provided, which elucidate the controlling role of the electric field on mobility and recombination zone. The equilibrium of two opposite charge carriers injection and the central position of recombination zone are two important preconditions for reducing the leakage current. Space-charge-limited current occurs only over a certain high bias, meanwhile, the quantity of injection carriers increases over the transport capacity of the bulk.展开更多
Two new molecules containing oxadiazoles and triphenylamine-stilbene moiety were synthesized. Their luminescent properties were determined, which indicated that they had strong green fluorescent properties. All the tw...Two new molecules containing oxadiazoles and triphenylamine-stilbene moiety were synthesized. Their luminescent properties were determined, which indicated that they had strong green fluorescent properties. All the two molecules can be used as green organic electrolumine- scence materials.展开更多
PPV-based copolymers with cyano group in the main chain have been synthesized by Wittig-type polycondensation of alkoxy-substituted dialdehydes and 4,4’-bis(cyanomethyl)-substituted diphenyl ether: [―C6H4―O―C6H4―...PPV-based copolymers with cyano group in the main chain have been synthesized by Wittig-type polycondensation of alkoxy-substituted dialdehydes and 4,4’-bis(cyanomethyl)-substituted diphenyl ether: [―C6H4―O―C6H4―C(CN)(CH―C6H2(OR)2―C(C(CN)―]n (POPPV). The copolymers are highly soluble in common solvents and their super highly transparent homogeneous thin films can be formed by spin coating directly without heat treatment. The chemical structures are determined by NMR and IR spectroscopys and evaluated using photoluminescence, gel-permeation chromatography (GPC) and DSC (or TGA) methods. The incorporation of ether group into the PPV backbone has an interruption of the main-chain conjugation, that results in the blue-shift of electroluminescence spectra and enhancement the solubility.展开更多
文摘Photovoltaic effects of rare earth organic electroluminescent devices(OELD), ITO/TPD/Gd(DBM) 3 bath, were described. Double OEL devices with Gd complex indicated considerable photovoltaic properties. About 20 μA·cm -2 of maximum short current ( I sc ) and 2 2 V of maximum voltage ( V oc ) of the photovolotaic cell with the rare earth complex under illumination UV lamp with 365 nm were achieved. Although the most sensitive response of it is at UV region, V oc larger than 1 5 V under solar illumination can also be observed. Under UV light illumination of 367 nm, V oc =844 mV, I sc =2 1 μA·cm -2 and 4% of energy transfer efficiency were measured.
文摘Double-layer orgainc electroluminescent devices have been constructed. A new fluorescent dye, 9,10-bis(phenylethynyl)anthracence was chosen as the dopant which was molecularly dispersed in the polymer film, and green light was observed from the device with luminance of 130cd/m2 at 17V.
基金This work was financed by the National Natural Science Foundation of China (Grant Nos. 29992530 and 19974002) the Paper Foundation of Northern Jiaotong University.
文摘By considering the interaction between Fowler-Nordheim tunneling injection theory and charge carriers transporting through the bulk, an electroluminescence model for organic single-layer diodes is presented. The expressions of the recombination current density, recombination efficiency and conductivity of the diodes are provided, which elucidate the controlling role of the electric field on mobility and recombination zone. The equilibrium of two opposite charge carriers injection and the central position of recombination zone are two important preconditions for reducing the leakage current. Space-charge-limited current occurs only over a certain high bias, meanwhile, the quantity of injection carriers increases over the transport capacity of the bulk.
基金the National Natural Science Foundation of China(No.20072018.29832030)for the financial support.
文摘Two new molecules containing oxadiazoles and triphenylamine-stilbene moiety were synthesized. Their luminescent properties were determined, which indicated that they had strong green fluorescent properties. All the two molecules can be used as green organic electrolumine- scence materials.
基金Natural Science Foundation of Tianjin(No.003602511).
文摘PPV-based copolymers with cyano group in the main chain have been synthesized by Wittig-type polycondensation of alkoxy-substituted dialdehydes and 4,4’-bis(cyanomethyl)-substituted diphenyl ether: [―C6H4―O―C6H4―C(CN)(CH―C6H2(OR)2―C(C(CN)―]n (POPPV). The copolymers are highly soluble in common solvents and their super highly transparent homogeneous thin films can be formed by spin coating directly without heat treatment. The chemical structures are determined by NMR and IR spectroscopys and evaluated using photoluminescence, gel-permeation chromatography (GPC) and DSC (or TGA) methods. The incorporation of ether group into the PPV backbone has an interruption of the main-chain conjugation, that results in the blue-shift of electroluminescence spectra and enhancement the solubility.
