High performance full color OLEDs based on a class of molecules with dual carrier transport channels and small singlet–triplet splitting

2015 ◽  
Vol 51 (53) ◽  
pp. 10632-10635 ◽  
Author(s):  
Chenglong Li ◽  
Shipan Wang ◽  
Weiping Chen ◽  
Jinbei Wei ◽  
Guochun Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Carrier Transport ◽  
Blue Emission ◽  
Deep Blue ◽  
Full Color ◽  
Triplet Splitting ◽  
Transport Channels

The strong deep blue emission, good ambipolar carrier transport and small singlet–triplet splitting characteristics allow PPI-PPITPA and PPI-PPIPCz as emitting materials and hosts to fabricate high performance full color OLEDs.

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

scholarly journals A skin-like two-dimensionally pixelized full-color quantum dot photodetector

2019 ◽  
Vol 5 (11) ◽  
pp. eaax8801 ◽  
Author(s):  
Jaehyun Kim ◽  
Sung-Min Kwon ◽  
Yeo Kyung Kang ◽  
Yong-Hoon Kim ◽  
Myung-Jae Lee ◽  
...  
Keyword(s):  
High Performance ◽  
Carrier Transport ◽  
Image Sensors ◽  
Indium Gallium Zinc Oxide ◽  
Practical Realization ◽  
Spectral Image ◽  
Oxide Semiconductors ◽  
Full Color ◽  
Efficient Charge ◽  
Color Filters

Direct full-color photodetectors without sophisticated color filters and interferometric optics have attracted considerable attention for widespread applications. However, difficulties of combining various multispectral semiconductors and improving photon transfer efficiency for high-performance optoelectronic devices have impeded the translation of these platforms into practical realization. Here, we report a low-temperature (<150°C) fabricated two-dimensionally pixelized full-color photodetector by using monolithic integration of various-sized colloidal quantum dots (QDs) and amorphous indium-gallium-zinc-oxide semiconductors. By introducing trap-reduced chelating chalcometallate ligands, highly efficient charge carrier transport and photoresistor-free fine-patterning of QD layers were successfully realized, exhibiting extremely high photodetectivity (>4.2 × 1017 Jones) and photoresponsivity (>8.3 × 103 A W−1) in a broad range of wavelengths (365 to 1310 nm). On the basis of these technologies, a wavelength discriminable phototransistor circuit array (>600 phototransistors) was implemented on a skin-like soft platform, which is expected to be a versatile and scalable approach for wide spectral image sensors and human-oriented biological devices.

scholarly journals Design of highly efficient deep-blue organic afterglow through guest sensitization and matrices rigidification

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Shen Xu ◽  
Wu Wang ◽  
Hui Li ◽  
Jingyu Zhang ◽  
Runfeng Chen ◽  
...  
Keyword(s):  
High Performance ◽  
Blue Emission ◽  
High Energy ◽  
Quantum Yields ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Organic Optoelectronics ◽  
Deep Blue ◽  
Formidable Challenge ◽  
High Efficient

Abstract Blue/deep-blue emission is crucial for organic optoelectronics but remains a formidable challenge in organic afterglow due to the difficulties in populating and stabilizing the high-energy triplet excited states. Here, a facile strategy to realize the efficient deep-blue organic afterglow is proposed via host molecules to sensitize the triplet exciton population of guest and water implement to suppress the non-radiative decays by matrices rigidification. A series of highly luminescent deep-blue (405–428 nm) organic afterglow materials with lifetimes up to 1.67 s and quantum yields of 46.1% are developed. With these high-performance water-responsive materials, lifetime-encrypted rewritable paper has been constructed for water-jet printing of high-resolution anti-counterfeiting patterns that can retain for a long time (>1 month) and be erased by dimethyl sulfoxide vapor in 15 min with high reversibility for many write/erase cycles. These results provide a foundation for the design of high-efficient blue/deep-blue organic afterglow and stimuli-responsive materials with remarkable applications.

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.

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.

scholarly journals Polymer additive engineering of K2CuBr3 nanocrystalline films to achieve efficient and stable deep-blue emission

2021 ◽  
Author(s):  
Xinzhen Ji ◽  
Zhuangzhuang Ma ◽  
Xu Chen ◽  
Di Wu ◽  
Yongtao Tian ◽  
...  
Keyword(s):  
High Performance ◽  
Blue Emission ◽  
Nanocrystalline Films ◽  
Practical Applications ◽  
Deep Blue ◽  
Pristine Sample ◽  
Color Displays ◽  
Potential Applications ◽  
Novel Strategy ◽  
High Humidity Environment

Abstract Recently, non-toxic alternatives to lead-halide perovskites have been greatly sought after in optoelectronics applications. Deep-blue luminescent material is mainly required for fabricating white light source and expanding the color gamut of full-color displays. However, the synthesis of high-performance lead-free perovskite films with efficient blue emission is still a critical challenge currently, limiting their further practical applications. Here, a novel strategy is reported to prepare non-toxic and deep-blue-emitting K2CuBr3 nanocrystalline films by introducing polymer poly(methyl methacrylate) (PMMA) additives into the anti-solvent. It is found that the PMMA additives could effectively reduce the grain size and improve the crystallinity of K2CuBr3 films, resulting in an enhanced radiative recombination by defect passivation and confinement of excitons in the nanograins. As a result, the PMMA-treated K2CuBr3 films achieve a bright deep-blue light with color coordinates at (0.155, 0.042), and the photoluminescence quantum yield obtained is about 3.3 times that of the pristine sample. Moreover, the treated K2CuBr3 films exhibit a substantially enhanced stability under harsh environmental conditions, maintaining >70% of their initial performances in high humidity environment (50‒70% humidity, 190 h) or under uninterrupted ultraviolet light radiation (254 nm, 3.4 mW/cm2, 150 h). These findings pave a promising strategy for achieving efficient and stable deep-blue metal halide films, showing their potential applications in optoelectronic devices.

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

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.

Anthracene-based bipolar deep-blue emitters for efficient white OLEDs with ultra-high stabilities of emission color and efficiency

2021 ◽  
Vol 9 (15) ◽  
pp. 5198-5205
Author(s):  
Xiangyu Zhu ◽  
Yinghao Li ◽  
Zilong Wu ◽  
Chengwei Lin ◽  
Dongge Ma ◽  
...  
Keyword(s):  
High Performance ◽  
Blue Emission ◽  
High Luminance ◽  
Emission Layer ◽  
Deep Blue ◽  
Emission Color ◽  
Blue Emitters ◽  
White Oleds

High-performance two-color hybrid warm white OLEDs are fabricated using TPA-TAn-DMAC as blue emission layer, achieving ultra-high stabilities of EL efficiency and color at high luminance over 30 000 cd m−2.

High-Performance and Low-Power Full Color Reflective LCD for New Applications

2019 ◽  
pp. 1411
Author(s):  
Hiroyuki Hakoi ◽  
Ming Ni ◽  
Junichi Hashimoto ◽  
Takashi Sato ◽  
Shinji Shimada ◽  
...  
Keyword(s):  
Low Power ◽  
High Performance ◽  
Full Color ◽  
New Applications
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