Highly Efficient Multifunctional Phosphorescent Dendrimers Consisting of an Iridium-Complex Core and Charge-Transporting Dendrons for Organic Light-Emitting Devices

2005 ◽  
Vol 871 ◽  
Author(s):  
Toshimitsu Tsuzuki ◽  
Nobuhiko Shirasawa ◽  
Toshiyasu Suzuki ◽  
Shizuo Tokito
Keyword(s):  
First Generation ◽  
Green Emission ◽  
Iridium Complex ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Complex Core ◽  
Bright Green ◽  
Organic Light Emitting Devices

AbstractWe report a novel class of emitting materials for use in the organic light-emitting devices (OLEDs): multifunctional phosphorescent dendrimers that have a phosphorescent core and have charge transporting dendrons. We have synthesized first-generation and second-generation dendrimers consisting of a fac-tris(2-phenylpyridine)iridium [Ir(ppy)3] core and hole transporting phenylcarbazole-based dendrons. Smooth amorphous films of these dendrimers were formed by spin-coating them from solutions. The OLEDs using the dendrimer exhibited bright green or yellowish-green emission from the Ir(ppy)3 core. The external quantum efficiency of the OLED using the mixture film of the first-generation dendrimer and an electron-transporting material was as high as 7.6%.

Synthesis and Properties of Novel Hole-Transporting Materials Containing Triphenylamine and Bipyridine Units

2013 ◽  
Vol 690-693 ◽  
pp. 619-622
Author(s):  
Hai Jun Lv ◽  
Yi Feng Yu ◽  
Lei Liu ◽  
Ai Bing Chen ◽  
Zhi Chao Hu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Green Emission ◽  
High Thermal Stability ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices ◽  
Hole Transporting Materials

Novel hole-transporting materials (M1, M2) containing triphenylamine and dipyridine units have been synthesized and characterized. Two compounds have excellent solubility in common solvents. The optical, electrochemical and thermal properties of the materials were studied in detail. The results show that two compounds have green emission in dichloromethane, high thermal stability and proper HOMO levels. The properties of compounds M1 and M2 indicate that two compounds are candidates for the application in Organic light-emitting devices as hole-transporting materials.

A High Tg Carbazole-Based Hole-Transporting Material for Organic Light-Emitting Devices

2005 ◽  
Vol 17 (5) ◽  
pp. 1208-1212 ◽  
Author(s):  
Jiuyan Li ◽  
Di Liu ◽  
Yanqing Li ◽  
Chun-Sing Lee ◽  
Hoi-Lun Kwong ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices ◽  
Hole Transporting Material

Improve the Efficiency of White Organic Light-Emitting Devices Using Double-Doped System

2010 ◽  
Vol 152-153 ◽  
pp. 687-690
Author(s):  
Gui Ying Ding ◽  
Wen Long Jiang ◽  
Guang De Wang ◽  
Qiang Han ◽  
Xi Chang
Keyword(s):  
Current Efficiency ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Maximum Current ◽  
Hole Transporting ◽  
White Oleds ◽  
Organic Light Emitting Devices ◽  
20 Nm ◽  
White Oled

The doped and non-doped white Organic light-emitting devices (OLEDs) were fabricated, using strong yellow emitting and hole-transporting ability of TPAHQZn. When the white OLED is a double-doped structure, greatly enhanced the efficiency of the device. The double-doped white device were fabricated as follows: ITO/2T-NATA (17 nm)/ CBP: 30% TPAHQZn: 8% Ir(ppy)3 (25 nm)/ NPBX (15 nm)/BCP(8nm)/TPBi: 10% Ir(ppy)3 (15nm)/Alq3 (20 nm)/LiF (1.3 nm)/Al. The double-doped white OLEDs were obtained with Commission International de L’Eclairage coordinates of (0.29,0.28) at 17 V, the maximum current efficiency increaed four times that double-doped white device of 4.12cd/A(8V) than non-doped of 1.03 cd/A (10V) .

Small molecular hole-transporting and emitting materials for hole-only green organic light-emitting devices

2016 ◽  
Vol 131 ◽  
pp. 41-48 ◽  
Author(s):  
Xicheng Liu ◽  
Junfei Liang ◽  
Jing You ◽  
Lei Ying ◽  
Yin Xiao ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

An efficient hole-transporting blue fluorophore 3,6-dipyrenyl-9-ethylcarbazole for undoped organic light-emitting devices

2012 ◽  
Vol 162 (5-6) ◽  
pp. 415-418 ◽  
Author(s):  
Qing-Xiao Tong ◽  
Shiu-Lun Lai ◽  
Ming-Fai Lo ◽  
Mei-Yee Chan ◽  
Tsz-Wai Ng ◽  
...  
Keyword(s):  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

Blue and White Organic Light-Emitting Devices Using 2,5-Diphenyl -1, 4-Distyrylbenzene with Two Trans-Double Bonds as a Blue Emitting Layer

2005 ◽  
Vol 475-479 ◽  
pp. 1805-1808
Author(s):  
Gang Cheng ◽  
Zengqi Xie ◽  
Ying Fang Zhang ◽  
Yuguang Ma ◽  
Shi Yong Liu
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Maximum Efficiency ◽  
Double Bonds ◽  
Yellow Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

A novel derivative of oligo(phenylenvinylene) (OPV), 2,5-diphenyl -1, 4-distyrylbenzene with two trans-double bonds (trans-DPDSB), is used as a blue emitting material in blue and white organic light-emitting devices (OLEDs). Blue devices with a configuration of indium-tin oxide (ITO)/N,N´-diphenyl-N,N´-bis(1-naphthyl)-(1,1´-biphenyl)-4,4´-diamine (NPB)/ trans-DPDSB / tris (8-hydroxyquinoline) aluminum (Alq3)/LiF/Al are constructed, where NPB, Alq3 and trans-DPDSB are used as hole-transporting, electron-transporting and light-emitting layers, respectively. The color of emission is changed from blue-green to pure blue when the trans-DPDSB layer is thicker. By inserting an ultrathin 5,6,11,12-tetraphenylnaphthacene (rubrene) yellow light-emitting layer between the Alq3 and trans-DPDSB layers, white OLEDs are obtained. The maximum efficiency and luminance of the blue and white devices are 1.2, 3.0 cd/A, and 1400, 7000 cd/m2, respectively.

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