Fluorene-Based Phosphine Oxide Host Materials for Blue Electrophosphorescence: An Effective Strategy for a High Triplet Energy Level

2011 ◽  
Vol 17 (9) ◽  
pp. 2592-2596 ◽  
Author(s):  
Donghui Yu ◽  
Yongbiao Zhao ◽  
Hui Xu ◽  
Chunmiao Han ◽  
Dongge Ma ◽  
...  
Keyword(s):  
Energy Level ◽  
Phosphine Oxide ◽  
Effective Strategy ◽  
Triplet Energy ◽  
Host Materials

New host materials with high triplet energy level for blue-emitting electrophosphorescent device

2007 ◽  
Vol 157 (18-20) ◽  
pp. 743-750 ◽  
Author(s):  
Joo Hyun Kim ◽  
Do Yeung Yoon ◽  
Ji Whan Kim ◽  
Jang-Joo Kim
Keyword(s):  
Energy Level ◽  
Triplet Energy ◽  
New Host ◽  
Host Materials

A Simple Phosphine-Oxide Host with a Multi-insulating Structure: High Triplet Energy Level for Efficient Blue Electrophosphorescence

2011 ◽  
Vol 17 (21) ◽  
pp. 5800-5803 ◽  
Author(s):  
Chunmiao Han ◽  
Yongbiao Zhao ◽  
Hui Xu ◽  
Jiangshan Chen ◽  
Zhaopeng Deng ◽  
...  
Keyword(s):  
Energy Level ◽  
Phosphine Oxide ◽  
Triplet Energy

Highly Efficient Solar-driven Photocatalytic Hydrogen Evolution by Ternary 3D ZnIn2S4-MoS2 Microsphere/1D TiO2 Nanobelt Heterostructure

2021 ◽  
Author(s):  
Hanghang Zhou ◽  
Lan Wang ◽  
Hang Shi ◽  
Huan Zhang ◽  
Yue Wang ◽  
...  
Keyword(s):  
Energy Level ◽  
High Activity ◽  
Hydrogen Evolution ◽  
Solvothermal Method ◽  
Semiconductor Materials ◽  
Effective Strategy ◽  
Geometric Structures ◽  
Photocatalytic Hydrogen Evolution ◽  
Highly Efficient ◽  
Tio2 Nanobelts

Combining different semiconductor materials with diverse geometric structures and energy level configurations is an effective strategy for constructing high-activity heterostructure photocatalyst. Using the solvothermal method, 1D TiO2 nanobelts were uniformly...

scholarly journals Pyridinyl-Carbazole Fragments Containing Host Materials for Efficient Green and Blue Phosphorescent OLEDs

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4615
Author(s):  
Dovydas Blazevicius ◽  
Daiva Tavgeniene ◽  
Simona Sutkuviene ◽  
Ernestas Zaleckas ◽  
Ming-Ruei Jiang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Triplet Energy ◽  
New Host ◽  
High Brightness ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Host Materials

Pyridinyl-carbazole fragments containing low molar mass compounds as host derivatives H1 and H2 were synthesized, investigated, and used for the preparation of electro-phosphorescent organic light-emitting devices (PhOLEDs). The materials demonstrated high stability against thermal decomposition with the decomposition temperatures of 361–386 °C and were suitable for the preparation of thin amorphous and homogeneous layers with very high values of glass transition temperatures of 127–139 °C. It was determined that triplet energy values of the derivatives are, correspondingly, 2.82 eV for the derivative H1 and 2.81 eV for the host H2. The new derivatives were tested as hosts of emitting layers in blue, as well as in green phosphorescent OLEDs. The blue device with 15 wt.% of the iridium(III)[bis(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) emitter doping ratio in host material H2 exhibited the best overall characteristics with a power efficiency of 24.9 lm/W, a current efficiency of 23.9 cd/A, and high value of 10.3% of external quantum efficiency at 100 cd/m2. The most efficient green PhOLED with 10 wt% of Ir(ppy)3 {tris(2-phenylpyridine)iridium(III)} in the H2 host showed a power efficiency of 34.1 lm/W, current efficiency of 33.9 cd/A, and a high value of 9.4% for external quantum efficiency at a high brightness of 1000 cd/m2, which is required for lighting applications. These characteristics were obtained in non-optimized PhOLEDs under an ordinary laboratory atmosphere and could be improved in the optimization process. The results demonstrate that some of the new host materials are very promising components for the development of efficient phosphorescent devices.

Tuning peripheral group density in ternary phosphine oxide hosts for low-voltage-driven yellow PhOLEDs

2015 ◽  
Vol 3 (26) ◽  
pp. 6709-6716 ◽  
Author(s):  
Jing Li ◽  
Zhensong Zhang ◽  
Chunmiao Han ◽  
Dongxue Ding ◽  
Yi Zhao ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Light Emitting Diodes ◽  
Low Voltage ◽  
Organic Light Emitting Diodes ◽  
Diphenylphosphine Oxide ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials ◽  
Group Density

Fluorene and diphenylphosphine oxide were employed as peripheral groups to construct ternary host materials DBFxPODEFn with benzofuran as a core, which realized the low-voltage-driven efficient yellow phosphorescence organic light-emitting diodes.

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