已为您找到该学者10条结果 成果回收站
马於光 , Song Qiu, Ping Lu, Xiao Liu, Fangzhong Shen, Linlin Liu, Yuguang Ma, * and Jiacong Shen
Macromolecules 2003, 36, 9823-9829,-0001,():
-1年11月30日
A type of soluble and thermally stable ladder-type poly(p-phenylene) (LPF) with fluorene units in polymer backbone has been synthesized by Suzuki coupling and Friedel-Crafts ring-closing reaction. The full characterization of structures and properties as well as the performances of electroluminescence devices of the new ladder polymers are presented. LPFs show the well-defined structures, high molecular weights, excellent thermal stability, and good solubility in common organic solvents. The high-efficiency emission and absence of low-energy emission band in photoluminescence spectra are observed from LPFs both in the solution and in the solid film. Furthermore, the single layer light-emitting device using LPFs as the active layer shows very stable blue-green emission with maximum luminescence of 5400 cd/m2 and maximum luminance efficiency of 0.66 cd/A. The extraordinary low concentration of keto defects in LPFs may be corresponding to the improvement in optical and device properties. The attractive properties exhibited by new ladder-type poly(p-phenylene)s establish them as good candidates for active layers in light-emitting devices.
-
41浏览
-
0点赞
-
0收藏
-
0分享
-
105下载
-
0
-
引用
马於光 , By Yuguang Ma, * Chi-Ming Che, Hsiu-Yi Chao, Xuemei Zhou, Wing-Han Chan, and Jiaocong Shen
Adv. Mater. 1999, 11, No.10,-0001,():
-1年11月30日
-
35浏览
-
0点赞
-
0收藏
-
0分享
-
91下载
-
0
-
引用
马於光 , By Shidong Kan, Xiaodong Liu, Fangzhong Shen, Jingying Zhang, Yuguang Ma, * Guo Zhang, Yue Wang, and Jiacong Shen
Adv Funct. Mater. 2003, 13, No.8, August,-0001,():
-1年11月30日
We demonstrate novel organic light-emitting diode (LED) materials that contain a green phosphorescent dye (dmbpy)Re(CO)3Cl (dmbpy 4,4'-dimethyl-2,2'-bipyridine), and a red fluorescent dye 4-dicyanomethylene-6-(p-dimethylaminostyryl)-2-methyl-4H-pyran (DCM) as dopants and polyvinylcarbazole (PVK) as the host. The photoluminescence (PL) and electroluminescence (EL) properties of these complex materials were studied. The energy transfer efficiency from PVK host to DCM is increased by the (dmbpy)Re(CO)3Cl co-dopant, which has an emission energy between that of PVK and DCM. The (dmbpy)Re(CO)3Cl, which emits a long-lived phosphorescence, is used as an energy coupler, providing the possibility to harvest both singlet and triplet energy in the devices. The pure red emission from DCM was observed from PL and EL spectra of (dmbpy)Re(CO)3-CI(>2.0 wt.-% ):DCM(>0.5 wt.%) doped PVK films, demonstrating an efficient energy transfer from PVK and (dmbpy)Re(CO)3-CI to DCM. By optimizing the concentration of DCM and (dmbpy)Re(CO)3Cl in PVK, a maximum EL quantum efficiency of 0.42 cd A 1 at a current density of 9.5 mA cm 2 was obtained. The EL quantum efficiency of the doubly doped device is significantly enhanced in comparison with both a DCM-only doped PVK device and a DCM-doped PVK device with the green fluorescent dye Alq3 as co-dopant. The improvement in the operating characteristics of the phosphorescent and fluorescent dye doubly doped device is attributed to efficient energy transler in the system, in which both triplet and singlet excitons are used for resultant emission in the polymer device.
-
21浏览
-
0点赞
-
0收藏
-
0分享
-
90下载
-
0
-
引用
【期刊论文】Triplet luminescent dinuclear-gold
马於光 , Yuguang Ma, a) Xuemei Zhou, and Jiacong Shen, Hsiu-Yi Chao and Chi-Ming Che b)
APPLIED PHYSICS LETTERS VOLUME 74, NUMBER 10 8 MARCH 1999,-0001,():
-1年11月30日
The electroluminescence [EL] from a dinuclear-gold(I)-chlorate compound containing bridging phosphine ligands [Au2]dppm(Cl2) as emitting layer is reported. Devices with a structure Al/Au2(dppm)Cl2 /indium-tin-oxide demonstrated a uniform emission under the driving voltage below 1 V. The EL emission was from triplet excited state and the emission color of the device was found to depend on the deposition rate of Au2(dppm)Cl2, which can be explained as the different aggregation forms of the stacking compound in the deposition process.
-
44浏览
-
0点赞
-
0收藏
-
0分享
-
74下载
-
0
-
引用
马於光 , By Yuguang Ma, * Tianshu Lai, and Ying Wu
Adv. Mater. 2000, 12, No.6,-0001,():
-1年11月30日
-
39浏览
-
0点赞
-
0收藏
-
0分享
-
55下载
-
0
-
引用