Deep blue organic light-emitting devices enabled by bipolar phenanthro[9,10-d]imidazole derivatives

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 72009-72018 ◽  
Author(s):  
Shuo Chen ◽  
Yukun Wu ◽  
Yi Zhao ◽  
Daining Fang
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Imidazole Derivatives ◽  
Deep Blue ◽  
Organic Light ◽  
Organic Light Emitting Devices

Novel phenanthroimidazole derivatives with D–π–A structures have been successfully designed and prepared. Non-doped organic light emitting diodes (OLEDs) were fabricated by employing the compounds, which display deep blue emission.

scholarly journals Efficient Exciplex-Based Deep-Blue Organic Light-Emitting Diodes Employing a Bis(4-fluorophenyl)amine-Substituted Heptazine Acceptor

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5568
Author(s):  
Jie Li ◽  
Heqi Gong ◽  
Jincheng Zhang ◽  
Hui Liu ◽  
Li Tao ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Photoluminescence Quantum Yield ◽  
Organic Light ◽  
High Maximum ◽  
Exciplex Emission ◽  
Amine Groups

The realization of a deep-blue-emitting exciplex system is a herculean task in the field of organic light-emitting diodes (OLEDs) on account of a large red-shifted and broadened exciplex emission spectrum in comparison to those of the corresponding single compounds. Herein, 2,5,8-tris(di(4-fluorophenyl)amine)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3FDPA) was designed as an electron acceptor by integrating three bis(4-fluorophenyl)amine groups into a heptazine core, while 1,3-di(9H-carbazol-9-yl)benzene (mCP) possessing two electron-donating carbazole moieties was chosen as the electron donor. Excitingly, the exciplex system of 8 wt% HAP-3FDPA:mCP exhibited deep-blue emission and a high photoluminescence quantum yield of 53.2%. More importantly, an OLED containing this exciplex system as an emitting layer showed deep-blue emission with Commission Internationale de l’Eclairage coordinates of (0.16, 0.12), a peak luminance of 15,148 cd m−2, and a rather high maximum external quantum efficiency of 10.2% along with a low roll-off. This study not only reports an efficient exciplex-based deep-blue emitter but also presents a feasible pathway to construct highly efficient deep-blue OLEDs based on exciplex systems.

Dibenzo[f,h]furo[2,3-b]quinoxaline-based molecule scaffold as deep blue fluorescence materials for organic light-emitting diodes

2021 ◽  
Author(s):  
XinYe Wang ◽  
Yuan Wu ◽  
ChuanMing Wu ◽  
Yixiang Li ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Molecular Scaffolds ◽  
Blue Fluorescence ◽  
Light Emitting ◽  
Highly Efficient ◽  
Deep Blue ◽  
Organic Light

Two novel molecular scaffolds, dibenzo[f,h]furo[2,3-b]quinoxaline (diBFQ) and its derivative, 3,6-bis(4-isopropylphenyls)-11-phenyldibenzo[f,h]furo[2,3-b]quinoxaline (dP-diBFQ), and furo[2',3':5,6]pyrazino[2,3-f][1,10]phenanthroline (FPPhen), were designed and syn-thesized for highly efficient pure and deep blue emission. The unsubstituted molecule scaffold...

Yellow Organic Light-Emitting Devices Based on Alq Doped DPIHQZn

2013 ◽  
Vol 785-786 ◽  
pp. 563-566
Author(s):  
Yong Hui Gao ◽  
Zhong Qi You ◽  
Wen Long Jiang
Keyword(s):  
Applied Voltage ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Hole Transporting ◽  
Organic Light Emitting Devices

The Electroluminescence (EL) characteristics of a novel yellow emitting material (DPIHQZn) were investigated in this paper. The results demonstrated the DPIHQZn with strong emitting and hole-transporting ability. Based on the performance,a series of doping yellow organic light-emitting diodes were fabricated.The yellow devices were fabricated as follows: ITO/ 2T-NATA(40 nm)/NPB(10 nm)/Alq:x%DPIHQZn (35 nm)/Alq (35 nm)/LiF(5 nm)/ Al,x=1,2,3,5;the maximum luminance was 3180 cd/m2at an applied voltage of 15V,while the Commission International de LEclairage coordinates was (0.40,0.48).

scholarly journals Color-Tunable Organic Light Emitting Diodes for Deep Blue Emission by Regulating the Optical Micro-Cavity

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2867
Author(s):  
Jixin Jiang ◽  
Weiye Zheng ◽  
Junfei Chen ◽  
Zheng Xu ◽  
Dandan Song ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Resonant Cavity ◽  
Blue Emission ◽  
Optical Path ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Blue Emitters ◽  
Micro Cavity

Nowadays, most blue organic light emitting diodes (OLEDs) are fabricated by using sky-blue emitters which are more easily synthesized when compared with other deep blue emitters. Herein, we put forward a new idea of using an optical micro-cavity based on metal electrodes to regulate electroluminance (EL) spectra of sky-blue organic light emitting diodes to obtain a saturated deep blue emission with a narrowed full-width at half-maximum (FWHM). First, we simulate micro-cavity OLEDs and find that the transmission of the anode plays an important role in the forward emission. Meanwhile, the optical path of micro-cavity OLEDs as well as the phase shifting from electrodes influence the EL spectra and induce the extra intensity enhancement. The results show that when the resonant cavity optical path is regulated by changing the thickness of emitting layer (EML) from 25 nm to 75 nm in the micro-cavity, the EL peak of blue OLEDs has a redshift from 479 nm to 493 nm with FWHM shifting from 69.8 nm to 83.2 nm, when compared to the device without the micro-cavity, whose approximate EL peak and FWHM are 487 nm and 87 nm, respectively. However, the efficiency of electroluminescence decreases in micro-cavity OLEDs. We speculate that this is on account of the ohmic contact between ITO and Ag, the surface plasma effect and the rough morphology induced by Ag electrodes.

High-efficiency non-doped deep-blue fluorescent organic light-emitting diodes based on carbazole/phenanthroimidazole derivatives

2020 ◽  
Vol 8 (30) ◽  
pp. 10185-10190
Author(s):  
Jianhui Xin ◽  
Zhiqiang Li ◽  
Yijun Liu ◽  
Dan Liu ◽  
Feng Zhu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
High Emission ◽  
Low Efficiency

The non-doped OLEDs with 2FPPICz and 2FPPIPCz as emitters exhibit deep-blue emission with maximum external quantum efficiencies of 4.3% and 5.6%, respectively. The device with 2FPPIPCz has a high emission luminance up to 24 150 cd m−2 and a low efficiency roll-off at 1000 cd m−2.

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