Solution processed blue phosphorescent organic light emitting diodes using a Ge-based small molecular host

2015 ◽  
Vol 3 (19) ◽  
pp. 5017-5025 ◽  
Author(s):  
Chuang Yao ◽  
Qianling Cui ◽  
Jinghong Peng ◽  
Xinjun Xu ◽  
Ronghua Liu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Theoretical Calculations ◽  
Organic Light Emitting Diodes ◽  
Host Material ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Blue Phosphorescent

A novel Ge-based host material is screened using theoretical calculations and synthesized for use as solution processed blue PhOLEDs.

scholarly journals Solution-Processed Efficient Blue Phosphorescent Organic Light-Emitting Diodes (PHOLEDs) Enabled by Hole-Transport Material Incorporated Single Emission Layer

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 554
Author(s):  
Taeshik Earmme
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Emission Layer ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Single Emission ◽  
Blue Phosphorescent

Solution-processed blue phosphorescent organic light-emitting diodes (PHOLEDs) based on a single emission layer with small-molecule hole-transport materials (HTMs) are demonstrated. Various HTMs have been readily incorporated by solution-processing to enhance hole-transport properties of the polymer-based emission layer. Poly(N-vinylcarbazole) (PVK)-based blue emission layer with iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C2′)picolinate (FIrpic) triplet emitter blended with solution-processed 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) gave luminous efficiency of 21.1 cd/A at a brightness of 6220 cd/m2 with an external quantum efficiency (EQE) of 10.6%. Blue PHOLEDs with solution-incorporated HTMs turned out to be 50% more efficient compared to the reference device without HTMs. The high hole mobility, high triplet energy of HTM, and favorable energy transfer between HTM blended PVK host and FIrpic blue dopant were found to be important factors for achieving high device performance. The results are instructive to design and/or select proper hole-transport materials in solution-processed single emission layer.

Highly efficient blue phosphorescent iridium(iii) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes

2017 ◽  
Vol 5 (36) ◽  
pp. 9306-9314 ◽  
Author(s):  
Peng Tao ◽  
Yuanbing Zhang ◽  
Jiong Wang ◽  
Liuwei Wei ◽  
Hongxin Li ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Ancillary Ligands ◽  
Light Emitting ◽  
Chemical Structures ◽  
Highly Efficient ◽  
Organic Light ◽  
Blue Phosphorescent

Excellent blue/pure blue iridium(iii) phosphors with high ΦPL, narrow FWHMs and robust chemical structures are designed for partially solution-processed OLEDs.

Efficient triplet utilization in conventional solution-processed phosphorescent organic light emitting diodes using a thermal activated delayed fluorescence polymer as an assistant host

2018 ◽  
Vol 6 (17) ◽  
pp. 4800-4806 ◽  
Author(s):  
Dianming Sun ◽  
Zhongjie Ren ◽  
Shouke Yan
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Host Material ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light ◽  
Conventional Solution

A TADF polymer COPO is used as an assistant host material to improve the performance of Ir(mPPy)3-based solution-processed devices.

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