Preparation and Characterization of Novel Polyfluorenes Derivatives Containing Phenanthro[9,10-d]imidazole Group for Deep Blue-Light-Emitting Polymers

2013 ◽  
Vol 710 ◽  
pp. 17-20 ◽  
Author(s):  
Zhi Ming Wang ◽  
Ling Ling Ma ◽  
Xiao Juan Zhang
Keyword(s):  
Blue Light ◽  
High Performance ◽  
Blue Emission ◽  
Bulky Substituent ◽  
Light Emitting ◽  
Imidazole Group ◽  
Deep Blue ◽  
Film Forming

A series of novel polyfluorenes derivatives containing different ratio of phenanthro -[9,10-imidazole (PI) group on backbone are designed, synthesized and well characterized. Comparing with the class blue polymer PF, they all exhibit deep blue emission in solution and film with high PL efficiency, and show better film forming ability because of the insert of bulky substituent on PI unit by the AFM measurement. The CV results of all compounds deliver balanced carriers injection ability, and the decreased LUMO levels and improved HOMO levels are observed, which is befit of the preparation of high performance deep blue OLED.

scholarly journals Rational design and characterization of heteroleptic phosphorescent iridium(iii) complexes for highly efficient deep-blue OLEDs

2016 ◽  
Vol 4 (43) ◽  
pp. 10246-10252 ◽  
Author(s):  
Yansong Feng ◽  
Xuming Zhuang ◽  
Dongxia Zhu ◽  
Yu Liu ◽  
Yue Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Rational Design ◽  
Organic Light Emitting Diodes ◽  
Iridium Complexes ◽  
High Luminance ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Low Efficiency

Deep-blue phosphorescent organic light emitting diodes (PhOLEDs) based on new heteroleptic iridium complexes achieve remarkably high performance with low efficiency roll-off at high luminance.

Synthesis and Characterization of Highly Twisted and Bulky Tetraoctyloxybiphenyl-Containing Polyfluorene Copolymers: Toward Efficient Blue Polymer Light Emitting Diodes

2007 ◽  
Vol 7 (11) ◽  
pp. 3810-3814
Author(s):  
In-Nam Kang ◽  
Sung-Hwan Lim ◽  
Jong-Wook Park ◽  
Kyoung-Soo Kim ◽  
Min-Chul Chung ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Random Copolymers ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Pl Emission

We have synthesized new blue light emitting random copolymers, poly(9,9′-n-dioctylfluorene-co-2,2′,6,6′-tetraoctyloxybiphenyl-3,3′-diyl)s (PFTOBPs), via Ni(0)-mediated coupling reactions. The PL emission peaks of the resulting copolymers closely resembled those of the polyfluorene (PF) homopolymer. The EL devices fabricated using these copolymers exhibited highly pure blue emission with approximate 1931 CIE coordinates of (0.15, 0.15) at 1000 cd/m2. The maximum brightnesses ranged from 2000 to 12000 cd/m2 with maximum efficiencies from 0.53 to 0.97 cd/A. The efficiencies were found to increase as the fraction of TOBP in the copolymers was increased, which may result the inhibition of exciton quenching that is produced by the introduction of the highly twisted and bulky TOBP moieties into the copolymers.

scholarly journals Deep-Blue and Hybrid-White Organic Light Emitting Diodes Based on a Twisting Carbazole-Benzofuro[2,3-b]Pyrazine Fluorescent Emitter

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 353 ◽  
Author(s):  
Chen-Chao Huang ◽  
Miao-Miao Xue ◽  
Fu-Peng Wu ◽  
Yi Yuan ◽  
Liang-Sheng Liao ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diode ◽  
Blue Emission ◽  
Triplet Energy ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Deep Blue ◽  
Organic Light ◽  
White Oleds ◽  
White Oled

A novel deep-blue fluorescent emitter was designed and synthesized. The external quantum efficiency (ηEQE) of the blue-emitting, doped, organic light-emitting diode (OLED) was as high as 4.34%. The device also exhibited an excellent color purity with Commission Internationale de l’Eclairage (CIE) coordinates of x = 0.15 and y = 0.05. In addition, the triplet energy had a value of 2.7 eV, which is rare for an emitter with deep-blue emission, which makes it a preferred choice for high-performance white OLEDs. By optimizing the device architectures, the color of hybrid-white OLEDs could be tunable from warm white to cool white using the aforementioned material as a bifunctional material. That is, the ηEQE of the hybrid warm-white OLED is 20.1% with a CIE x and y of 0.46 and 0.48 and the ηEQE of the hybrid cool-white OLED is 9% with a CIE x and y of 0.34 and 0.33.

Synthesis and Characterization of Highly Twisted and Bulky Tetraoctyloxybiphenyl-Containing Polyfluorene Copolymers: Toward Efficient Blue Polymer Light Emitting Diodes

2007 ◽  
Vol 7 (11) ◽  
pp. 3810-3814 ◽  
Author(s):  
In-Nam Kang ◽  
Sung-Hwan Lim ◽  
Jong-Wook Park ◽  
Kyoung-Soo Kim ◽  
Min-Chul Chung ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Random Copolymers ◽  
Synthesis And Characterization ◽  
Coupling Reactions ◽  
Light Emitting ◽  
Polymer Light Emitting Diodes ◽  
Pl Emission

We have synthesized new blue light emitting random copolymers, poly(9,9′-n-dioctylfluorene-co-2,2′,6,6′-tetraoctyloxybiphenyl-3,3′-diyl)s (PFTOBPs), via Ni(0)-mediated coupling reactions. The PL emission peaks of the resulting copolymers closely resembled those of the polyfluorene (PF) homopolymer. The EL devices fabricated using these copolymers exhibited highly pure blue emission with approximate 1931 CIE coordinates of (0.15, 0.15) at 1000 cd/m2. The maximum brightnesses ranged from 2000 to 12000 cd/m2 with maximum efficiencies from 0.53 to 0.97 cd/A. The efficiencies were found to increase as the fraction of TOBP in the copolymers was increased, which may result the inhibition of exciton quenching that is produced by the introduction of the highly twisted and bulky TOBP moieties into the copolymers.

scholarly journals Efficient Deep-Blue Electroluminescence Employing Heptazine-Based Thermally Activated Delayed Fluorescence

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 293
Author(s):  
Jie Li ◽  
Jincheng Zhang ◽  
Heqi Gong ◽  
Li Tao ◽  
Yanqing Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diode ◽  
Blue Emission ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Deep Blue ◽  
Blue Emitters

We report an efficient deep-blue organic light-emitting diode (OLED) based on a heptazine-based thermally activated delayed fluorescent (TADF) emitter, 2,5,8-tris(diphenylamine)-tri-s-triazine (HAP-3DPA). The deep-blue-emitting compound, HAP-3DPA, was designed and synthesized by combining the relatively rigid electron-accepting heptazine core with three electron-donating diphenylamine units. Due to the rigid molecular structure and intramolecular charge transfer characteristics, HAP-3DPA in solid state presented a high photoluminescence quantum yield of 67.0% and obvious TADF nature with a short delayed fluorescent lifetime of 1.1 μs. Most importantly, an OLED incorporating HAP-3DPA exhibited deep-blue emission with Commission Internationale de l’Eclairage (CIE) coordinates of (0.16, 0.13), a peak luminance of 10,523 cd/m−2, and a rather high external quantum efficiency of 12.5% without any light out-coupling enhancement. This finding not only reports an efficient deep-blue TADF molecule, but also presents a feasible pathway to construct high-performance deep-blue emitters and devices based on the heptazine skeleton.

Tetraphenylbenzene-based AIEgens: the Horizontally Oriented Emitters for highly Efficient Non-doped Deep Blue OLEDs and Host for High-Performance Hybrid WOLEDs

2020 ◽  
Author(s):  
Pengbo Han ◽  
Zeng Xu ◽  
Chengwei Lin ◽  
Dongge Ma ◽  
Anjun Qin ◽  
...  
Keyword(s):  
High Performance ◽  
General Strategy ◽  
Flat Panel Displays ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Deep Blue ◽  
Full Color ◽  
High Emission ◽  
White Oleds ◽  
Low Efficiency

Deep blue organic-emitting fluorophores are crucial for application in white lighting and full color flat-panel displays but emitters with high color quality and efficiency are rare. Herein, novel deep blue AIE luminogens (AIEgens) with various donor units and an acceptor of cyano substituted tetraphenylbenzene (TPB) cores were developed and used to fabricate non-doped deep blue and hybrid white organic light-emitting diodes (OLEDs). Benefiting from its high emission efficiency and high proportion of horizontally oriented dipoles in the film state, the non-doped deep blue device based on CN-TPB-TPA realized a maximum external quantum efficiency 7.27%, with a low efficiency roll-off and CIE coordinates of (0.15, 0.08). Moreover, efficient two-color hybrid warm white OLEDs (CIE<sub>x,y</sub> = 0.43, 0.45) were achieved using CN-TPB-TPA as the blue-emitting layer and phosphor doped host, which realized maximum current, power, external quantum efficiencies 58.0 cd A<sup>-1</sup>, 60.7 lm W<sup>-1</sup> and 19.1%, respectively. This work provides a general strategy to achieve high performance, stable deep blue and hybrid white OLEDs by construction of AIEgens with excellent horizontal orientation

Bis(4-diphenylaminophenyl)carbazole end-capped fluorene as solution-processed deep-blue light-emitting and hole-transporting materials for electroluminescent devices

2012 ◽  
Vol 53 (28) ◽  
pp. 3615-3618 ◽  
Author(s):  
Daungratchaneekron Meunmart ◽  
Narid Prachumrak ◽  
Tinnagon Keawin ◽  
Siriporn Jungsuttiwong ◽  
Taweesak Sudyoadsuk ◽  
...  
Keyword(s):  
Blue Light ◽  
Solution Processed ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Deep Blue ◽  
Hole Transporting ◽  
Hole Transporting Materials
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