Zn(BTZ)2 was synthesized from the complex reaction between zinc acetate dihydrate and 2-(2-hydroxy- phenyl) benzothiazolate. Then Zn(BTZ)2 was used as main light-emitting material doped with different amounts of fluor...Zn(BTZ)2 was synthesized from the complex reaction between zinc acetate dihydrate and 2-(2-hydroxy- phenyl) benzothiazolate. Then Zn(BTZ)2 was used as main light-emitting material doped with different amounts of fluorescent dye Rubrene and fabricated a series of white organic light emitting devices. The configurations were as follows: ITO/PVK:TPD/Zn(BTZ)2:Rubrene/Al. The doping concentration of Rubrene in Zn(BTZ)2 was 1.2%, 0.12%, 0.08% and 0.05%, respectively. According to the EL spectra and CIE coordinates of the above devices, the optimum dop- ing concentration (0.05%, weight percent) had been deter- mined. The steady and bright white light emitting of the de- vice with 0.05% doping concentration had been obtained, and the white emission covered a wide range of driving volt- age (10 — 22.5 V). The CIE coordinates were (x=0.341, y=0.334) at the driving voltage of 20 V, which was very close to the equi-energy point (x=0.333, y=0.333), and the corre- sponding luminance and external quantum efficiency were 4048 Cd/m2 and 0.63% (4.05 Cd/A), respectively. Lastly, we also discussed the emitting mechanisms of the material and the devices.展开更多
High efficient polymer light-emitting diodes(PLEDs) were obtained by using a blend of conjugatedpolymer G-PF, a copolymer of fluorene and thiophene, andpolystyrene (PS). The maximum electroluminescent (EL)efficiency o...High efficient polymer light-emitting diodes(PLEDs) were obtained by using a blend of conjugatedpolymer G-PF, a copolymer of fluorene and thiophene, andpolystyrene (PS). The maximum electroluminescent (EL)efficiency of the device is 12 cd/A when G-PF/PS weight ratiois at 80/20, while that of pure G-PF device is 6.5 cd/A. Studieson photoluminescence and electroluminescence of the blendsindicate that inter-chain interactions were tremendouslysuppressed due to the dilution effect. However, after PS con-centration exceeds 20% the EL efficiency of the devices de-creases with further increase of PS concentration. This maybe due to the decrease of the recombination probability ofelectrons and holes with the excessive addition of PS insulator.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.60276027)Organic Solids Laboratory of Institute of Chemistry of Chinese Academy of Sciences,Tianjin Natural Science Key Foundation(Grant No.023800511)+2 种基金Tianjin Science Foundation(Grant No.033601211)Tianjin Science Development Foundation for University(Grant No.9903114)the Key Subject of the"Material Physics and the Chemistry"of Tianjin.
文摘Zn(BTZ)2 was synthesized from the complex reaction between zinc acetate dihydrate and 2-(2-hydroxy- phenyl) benzothiazolate. Then Zn(BTZ)2 was used as main light-emitting material doped with different amounts of fluorescent dye Rubrene and fabricated a series of white organic light emitting devices. The configurations were as follows: ITO/PVK:TPD/Zn(BTZ)2:Rubrene/Al. The doping concentration of Rubrene in Zn(BTZ)2 was 1.2%, 0.12%, 0.08% and 0.05%, respectively. According to the EL spectra and CIE coordinates of the above devices, the optimum dop- ing concentration (0.05%, weight percent) had been deter- mined. The steady and bright white light emitting of the de- vice with 0.05% doping concentration had been obtained, and the white emission covered a wide range of driving volt- age (10 — 22.5 V). The CIE coordinates were (x=0.341, y=0.334) at the driving voltage of 20 V, which was very close to the equi-energy point (x=0.333, y=0.333), and the corre- sponding luminance and external quantum efficiency were 4048 Cd/m2 and 0.63% (4.05 Cd/A), respectively. Lastly, we also discussed the emitting mechanisms of the material and the devices.
基金supported by the National Natural Science Foundation of China(Grant Nos.29992530 and 6998600)the National Science Foundation of USA(Grant No.ECS-9733355).
文摘High efficient polymer light-emitting diodes(PLEDs) were obtained by using a blend of conjugatedpolymer G-PF, a copolymer of fluorene and thiophene, andpolystyrene (PS). The maximum electroluminescent (EL)efficiency of the device is 12 cd/A when G-PF/PS weight ratiois at 80/20, while that of pure G-PF device is 6.5 cd/A. Studieson photoluminescence and electroluminescence of the blendsindicate that inter-chain interactions were tremendouslysuppressed due to the dilution effect. However, after PS con-centration exceeds 20% the EL efficiency of the devices de-creases with further increase of PS concentration. This maybe due to the decrease of the recombination probability ofelectrons and holes with the excessive addition of PS insulator.
