Deep Blue Organic Light-Emitting Diodes Based on [7,7-Dimethyl-9-(10-phenylanthracen-9-yl)-7H-Indeno[1,2-f] Isoquinoline] Derivatives

2020 ◽  
Vol 20 (11) ◽  
pp. 6648-6652
Author(s):  
Jinho Park ◽  
Beomsu Jang ◽  
Yu Ji Moon ◽  
Hakjun Lee ◽  
Young Kwan Kim ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Isoquinoline Derivatives

In this study, we synthesized and characterized two novel deep blue emitting materials based on indenoquinoline-substituted phenylanthracene derivatives. Multilayer organic light-emitting diodes were fabricated with the following sequence: indium-tin-oxide (ITO)/4,4′,4″-tris[2-naphthyl(phenyl)amino (2-TNATA)/4,4′-bis(N-N-naphthyl)-N-phenylamino) biphenyl (NPB)/Blue emitting material (1 or 2)/Bathophenanthroline (Bphen)/lithium quinolate (Liq)/Al. A device B using ‘7,7-dimethyl-9-(10-phenylanthracen-9-yl)-7H-indeno[1,2-f] isoquinoline (2)’ as an emitter showed the efficient emission with the luminous efficiency, power efficiency, and external quantum efficiency of 2.30 cd/A, 1.02 lm/W, 2.94% at 20 mA/cm2, respectively. This device exhibited deep-blue emission with the Commission Internationale De LÉnclairage (CIE) coordinates of (0.16, 0.08) and λmax = 436 nm at 8.0 V.

Highly Efficient 7,7-Dimethyl-9-(10-phenylanthracen-9-yl)-7H-Benzo[6,7]Indeno[1,2-f]Quinoline Derivatives for Blue Fluorescent Organic Light-Emitting Diodes

2021 ◽  
Vol 21 (8) ◽  
pp. 4341-4346
Author(s):  
Ju Hee Han ◽  
Jinho Park ◽  
Giwoong Han ◽  
Ki Ju Kim ◽  
Hakjun Lee ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
Quinoline Derivatives ◽  
Light Emitting ◽  
Highly Efficient ◽  
Organic Light ◽  
20 Nm

Highly efficient blue fluorescent 7,7-dimethyl-9-(10-phenylanthracen-9-yl)-7H-benzo[6,7]indeno[1,2- f]quinoline derivatives, based on benzo-indeno-quinoline and phenylanthracene were designed and synthesized. To test their electroluminescent properties, organic light-emitting diodes (OLEDs) were fabricated with the configuration of indium-tin-oxide (ITO) (150 nm)/4,4′,4″-Tris[2- naphthyl(phenyl)amino]triphenylamine (2-TNATA) (30 nm)/N,N′-di(1-naphthyl)-N,N′-diphenyl-1,1′- biphenyl)4,4′-diamine (NPB) (20 nm)/blue emitting materials (20 nm)/bathophenanthroline (Bphen) (30 nm)/Liq (2 nm)/Al (100 nm). The devices using these blue materials as emitters showed efficient blue emission. Particularly, a device employing 7,7-dimethyl-9-(10-phenylanthracen-9-yl)-7Hbenzo[ 6,7]indeno[1,2-f]quinoline as an emitting layer yielded the best performance with a luminous efficiency (LE), power efficiency (PE), and external quantum efficiency (EQE) and the Commission International de L’Eclairge (CIE) coordinates of 4.60 cd/A, 3.07 lm/W, 4.32% at 20 mA/cm2, and (0.16, 0.12) at 8.0 V, respectively.

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...

Indium-tin-oxide-free tris(8-hydroxyquinoline) Al organic light-emitting diodes with 80% enhanced power efficiency

2011 ◽  
Vol 99 (15) ◽  
pp. 153303 ◽  
Author(s):  
Min Cai ◽  
Teng Xiao ◽  
Rui Liu ◽  
Ying Chen ◽  
Ruth Shinar ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

High-Efficiency White Organic Light-Emitting Diodes Using Blue and Red Phosphorescent Materials with Exciton Blocking Layer

2008 ◽  
Vol 8 (9) ◽  
pp. 4607-4610
Author(s):  
Jung Hyun Park ◽  
Ji Hoon Seo ◽  
Ji Hyun Seo ◽  
Seok Jae Lee ◽  
Ja Ryong Koo ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Blue Emission ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Blocking Layer ◽  
Maximum Luminance ◽  
Red Emission ◽  
Light Emitting ◽  
Organic Light

High-efficiency white organic light-emitting diodes (WOLEDs) were fabricated with two emissive layers and an exciton blocking layer (EBL) was sandwiched between two phosphorescent dyes, bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) as the blue emission and iridium(III) bis(5-acetyl-2-phenylpyridinato-N,C2′) acetylacetonate ((acppy)2Ir(acac)) as the red emission. This EBL effectively prevented a triple–triple energy transfer between the two phosphorescent emissive layers with blue and red emission. The white device showed Commission Internationale De L'Eclairage (CIEx,y) coordinates of (0.33, 0.42) at 22400 cd/m2, a maximum luminance of 27300 cd/m2 at 13.2 V, and a maximum luminous efficiency of 26.9 cd/A.

Organic Light-Emitting Diodes Based on a Solution-Processable Benzimidazole-Functionalised Cationic Iridium Complex

2016 ◽  
Vol 69 (8) ◽  
pp. 890
Author(s):  
Xiujuan Zhi ◽  
Bin Du ◽  
Sichun Yuan
Keyword(s):  
Quantum Efficiency ◽  
Indium Tin Oxide ◽  
Power Efficiency ◽  
Light Emitting Diodes ◽  
Luminous Efficiency ◽  
Organic Light Emitting Diodes ◽  
Iridium Complex ◽  
High Brightness ◽  
Light Emitting ◽  
A Current

A cationic iridium(iii) complex with formula [Ir(ppy)2(pybmz)]+(PF6)– (ppy = 2-phenylpyridine; pybmz = 2-(pyridin-2-yl)-N-hexylbenzimidazole) was synthesised. The photoluminescence spectrum of the complex showed an orange–red emission peak at 590 nm with a quantum efficiency of 18 % and a luminescence lifetime of 1.2 µs in solid state. The complex was used as a phosphorescent dopant in light-emitting diodes with the configuration ITO/PEDOT : PSS(50 nm)/PVK (70) : PBD (30) : complex (x wt-%, x = 5, 20, 50, 100)(75nm)/TPBI(50nm)/Ba(4 nm)/Al(150 nm) [ITO = indium tin oxide; PEDOT = poly(ethylenedioxythiophene); PSS = poly(styrene sulfonic acid); PVK = polyvinylcarbazole; PBD = 5-(4-tert-butylphenyl)-2-(bi-phenyl-4-yl)-1,3,4-oxadiazole; TPBI = 1,3,5-tris-(2-N-phenylbenzimidazolyl) benzene]. The best device performances were obtained for the non-doped (100 wt-%) material, with an external quantum efficiency of 5.6 %, a luminous efficiency of 9.3 cd A–1, and a power efficiency of 3 lm W–1. High brightness of 8700 cd m–2 and luminous efficiency of 8 cd A–1 were realised at a current density of 110 mA cm–2.

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.

Sign in / Sign up

Export Citation Format

Share Document