scholarly journals Solubilised bright blue-emitting iridium complexes for solution processed OLEDs

2016 ◽  
Vol 4 (17) ◽  
pp. 3726-3737 ◽  
Author(s):  
Adam F. Henwood ◽  
Ashu K. Bansal ◽  
David B. Cordes ◽  
Alexandra M. Z. Slawin ◽  
Ifor D. W. Samuel ◽  
...  
Keyword(s):  
Blue Emission ◽  
Iridium Complex ◽  
Iridium Complexes ◽  
Solution Processed ◽  
Bright Blue

Combining a sterically bulky, electron-deficient cyclometalating C∧N ligands with an electron rich, highly rigidified N∧N ligand gives an iridium complex, that achieves extraordinarily bright blue emission (ΦPL = 90%; λmax = 459 nm in MeCN) for a cationic iridium complex.

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.

Constructing host-σ-guest structures to optimize the efficiency of non-doped solution-processed OLEDs

2021 ◽  
Author(s):  
Dan Liu ◽  
Meng Zhang ◽  
Haowen Chen ◽  
Daiyu Ma ◽  
Wenwen Tian ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Power Efficiency ◽  
Blue Emission ◽  
Solution Processed

Non-doped solution-processed OLEDs based on emitters with host-σ-guest structures showed blue emission with CIE (0.18, 0.31), 24.9 cd A−1 current efficiency and 9.5 lm W−1 power efficiency.

The New Iridium Complexes Involving Pyridylpyridine Derivatives for the Saturated Blue Emission

2012 ◽  
Vol 12 (1) ◽  
pp. 668-673 ◽  
Author(s):  
Hye Rim Park ◽  
Dong Hwan Lim ◽  
Young Kwan Kim ◽  
Yunkyoung Ha
Keyword(s):  
Blue Emission ◽  
Iridium Complexes

Highly efficient and solution-processed iridium complex for single-layer yellow electrophosphorescent diodes

2012 ◽  
Vol 22 (43) ◽  
pp. 23005 ◽  
Author(s):  
Xinhua Ouyang ◽  
Dongcheng Chen ◽  
Shuiming Zeng ◽  
Xingye Zhang ◽  
Shijian Su ◽  
...  
Keyword(s):  
Single Layer ◽  
Iridium Complex ◽  
Solution Processed ◽  
Highly Efficient

An oligocarbazole-encapsulated heteroleptic red iridium complex for solution-processed nondoped phosphorescent organic light-emitting diodes with over 10% external quantum efficiency

2017 ◽  
Vol 5 (23) ◽  
pp. 5749-5756 ◽  
Author(s):  
Lingcheng Chen ◽  
Shumeng Wang ◽  
Zhimin Yan ◽  
Junqiao Ding ◽  
Lixiang Wang
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

By fully encapsulating the heteroleptic red Ir complex with carbazole dendrons, solution-processed nondoped electrophosphorescent devices reveal over 10% EQE.

Cationic Iridium Dendrimers: Synthesis and Photophysical Properties

2011 ◽  
Vol 64 (9) ◽  
pp. 1211 ◽  
Author(s):  
Bin Du ◽  
Si-Chun Yuan ◽  
Jian Pei
Keyword(s):  
Solid State ◽  
Photophysical Properties ◽  
Dendritic Structure ◽  
Benzimidazole Derivatives ◽  
Iridium Complex ◽  
Iridium Complexes ◽  
Efficient Energy Transfer ◽  
Ancillary Ligands ◽  
Synthetic Strategy ◽  
Yellow Orange

Two dendrimers, D1 and D2, containing the cationic iridium complexes (C1 and C2) as cores and truxene-functionalized chromophores as the branches, have been developed by a convergent synthetic strategy. The cationic complexes employ 3-(pyridin-2-yl)-1H-1,2,4-triazole and 2-(pyridin-2-yl)-benzimidazole derivatives as the ancillary ligands. To avoid the change in emission colour arising from the iridium complex, the conjugation between the dendron and the ligand is decoupled by separating them using the alkyl chain. An investigation of their photoluminescent features reveals that efficient energy transfer happens from the dendrons to the core in the solid state. Likewise, the charged dendritic structure is demonstrated to be an efficient method to improve the compatibility between the polar charged iridium complexes and typical hydrophobic hosts with the additional benefit of excellent solution processability. Both dendrimers exhibit strong solvatochromic behaviours in solvents and exclusive green and yellow-orange light in the solid state.

Bright blue emission from Te-doped ZnS nanowires

2010 ◽  
Vol 130 (11) ◽  
pp. 2153-2156 ◽  
Author(s):  
Sangdan Kim ◽  
Taekyung Lim ◽  
Mi Jung ◽  
Ki-Jeong Kong ◽  
Ki-Seok An ◽  
...  
Keyword(s):  
Blue Emission ◽  
Bright Blue

Sky-blue-emitting cationic iridium complexes with carbazole-type counter-anions and their use for efficient solution-processed organic light-emitting diodes

2020 ◽  
Vol 49 (26) ◽  
pp. 8967-8975
Author(s):  
Renyou Yu ◽  
Pei Wang ◽  
Xianwen Meng ◽  
Lei He
Keyword(s):  
Efficient Solution ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complexes ◽  
Solution Processed ◽  
Light Emitting ◽  
Organic Light

Cationic iridium complexes with carbazole-type counter-anions show enhanced performances compared to those with PF6− counter-anions in OLEDs.

Power-efficient solution-processed red organic light-emitting diodes based on an exciplex host and a novel phosphorescent iridium complex

2016 ◽  
Vol 4 (24) ◽  
pp. 5787-5794 ◽  
Author(s):  
Xuejing Liu ◽  
Bing Yao ◽  
Zilong Zhang ◽  
Xiaofei Zhao ◽  
Baohua Zhang ◽  
...  
Keyword(s):  
Power Efficiency ◽  
Efficient Solution ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
Solution Processed ◽  
Power Efficient ◽  
Light Emitting ◽  
Organic Light ◽  
Cie Coordinates

A novel red heteroleptic iridium complex, Ir(DPA-Flpy-CF3)2acac, was synthesized and whose corresponding solution-processed PhOLED shows a record power efficiency of 44.5 lm W−1 with CIE coordinates of (0.64, 0.36).

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