High-efficiency solution-processed OLEDs based on cationic Ag6Cu heteroheptanuclear cluster complexes with aromatic acetylides

2016 ◽  
Vol 4 (9) ◽  
pp. 1787-1794 ◽  
Author(s):  
Liang-Jin Xu ◽  
Xu Zhang ◽  
Jin-Yun Wang ◽  
Zhong-Ning Chen
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
Bias Voltage ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Solution Processed ◽  
Cluster Complexes ◽  
Highly Efficient ◽  
A Current

Strongly phosphorescent cationic Ag6Cu cluster complexes show highly efficient electroluminescence from solution-processed OLEDs with a current efficiency of 42.5 cd A−1 and an external quantum efficiency of 13.9% at a low bias voltage (4.5 V).

Photoluminescence and electroluminescence of cationic PtAu2 heterotrinuclear complexes with aromatic acetylides

2017 ◽  
Vol 46 (3) ◽  
pp. 865-874 ◽  
Author(s):  
Li-Yi Zhang ◽  
Liang-Jin Xu ◽  
Jin-Yun Wang ◽  
Xian-Chong Zeng ◽  
Zhong-Ning Chen
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Solution Process ◽  
Heterometallic Complexes ◽  
Highly Efficient

Cationic PtAu2 heterometallic complexes are used as phosphorescent emitters for highly efficient electroluminescent OLEDs through a solution process with the highest current efficiency of 51.7 cd A−1 and external quantum efficiency of 14.5%.

Synthesis and Electroluminescence Property of Anthracene Green Fluorescent Derivatives Based on Optimized Side Groups

2021 ◽  
Vol 21 (7) ◽  
pp. 4037-4041
Author(s):  
Sangshin Park ◽  
Hyukmin Kwon ◽  
Seokwoo Kang ◽  
Sunwoo Park ◽  
Hyocheol Jung ◽  
...  
Keyword(s):  
Electric Field ◽  
Energy Conversion ◽  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Molecular Size ◽  
Green Fluorescent ◽  
Fluorescent Derivatives ◽  
Electroluminescence Property

Molecular size of OLED emitting materials is nano-metric size and when it is applied to the electric field it emits the light based on the energy conversion result. As new green fluorescent emitters, N,N,N',N'-Tetra-m-tolyl-anthracene-9,10-diamine (m-Me-TAD) and N,N,N',N'-Tetra-p-tolyl-anthracene-9,10-diamine (p-Me-TAD) were synthesized and the properties were evaluated. In solution state, photoluminescence (PL) maximum wavelength is 517 nm for m-Me-TAD and 529 nm for p-Me-TAD. In electroluminescence (EL) spectra, EL maximum wavelength of m-Me-TAD is 518 nm and p-Me-TAD is 533 nm. The doped device using m-Me-TAD as green fluorescent dopant exhibited current efficiency (CE) of 17.41 cd/A and external quantum efficiency (EQE) of 7.41%. The doped device with p-Me-TAD was optimized in order to achieve a green OLED with high efficiency.

Non-halogenated solvent-processed highly efficient green Ir(iii) complexes with an external quantum efficiency exceeding 23% for phosphorescent organic light-emitting diodes

2020 ◽  
Vol 8 (37) ◽  
pp. 12959-12967
Author(s):  
Raja Kumaresan ◽  
Athithan Maheshwaran ◽  
Ho-Yeol Park ◽  
Kyungmin Sung ◽  
Jungmin Choi ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Highly Efficient ◽  
Organic Light

High efficiency green phosphorescent Ir(III) complexes with solubilizing groups introduced to enable non-halogenated solvent-based fabrication of PHOLEDs with high EQE and CE values.

High Efficiency Green Fluorescent Dopant Through the Optimized Side Group for Organic Light Emitting Diodes

2021 ◽  
Vol 21 (7) ◽  
pp. 4000-4004
Author(s):  
Hyukmin Kwon ◽  
Seokwoo Kang ◽  
Sangshin Park ◽  
Sunwoo Park ◽  
Seungeun Lee ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Green Light ◽  
Molecular Size ◽  
Electrical Energy ◽  
Light Emitting ◽  
Tert Butyl ◽  
Green Fluorescent

OLED light emitting materials have a molecular size corresponding to the nano scale and are converted into light energy when given electrical energy. The new green fluorescent dopant material was successfully synthesized by using anthracene as a central core and introducing a methyl group and tert-butyl group at various positions as diphenylamine group. Two compounds are N9,N9,N10,N10-tetraphenylanthracene-9,10-diamine (TAD) and N9,N10-bis(4-(tert-butyl) phenyl)-N9,N10-di-o-tolylanthracene-9,10-diamine (p-Tb-o-Me-TAD). The synthesized material emits green light with the maximum wavelengths of 508 and 523 nm. p-Tb-o-Me-TAD shows excellent PLQY of 86.2% in solution state. When the synthesized material was used as a dopant in a device, TAD showed current efficiency (CE) of 17.71 cd/A and external quantum efficiency (EQE) of 6.11%. The device using p-Tb-o-Me-TAD dopant exhibited current efficiency (CE) of 24.24 cd/A and external quantum efficiency (EQE) of 7.27%.

High-efficiency organic light-emitting diodes of phosphorescent PtAg2heterotrinuclear acetylide complexes supported by triphosphine

2017 ◽  
Vol 5 (12) ◽  
pp. 3072-3078 ◽  
Author(s):  
Yi-Peng Li ◽  
Xin-Xia Fan ◽  
Yue Wu ◽  
Xian-Chong Zeng ◽  
Jin-Yun Wang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Heterometallic Cluster ◽  
Organic Light ◽  
New Type ◽  
Heterometallic Cluster Complexes

Platinum(ii)–silver(i) heterometallic cluster complexes are used as a new type of phosphorescent dopant to achieve high-efficiency OLEDs with 67.4 cd A−1peak current efficiency (CE) and 17.4% external quantum efficiency (EQE).

Highly efficient yellow electroluminescence of iridium complexes with good electron mobility

2018 ◽  
Vol 2 (7) ◽  
pp. 1284-1290 ◽  
Author(s):  
Hua-Bo Han ◽  
Xiao-Feng Ma ◽  
Zheng-Guang Wu ◽  
You-Xuan Zheng
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
Electron Mobility ◽  
External Quantum Efficiency ◽  
Iridium Complexes ◽  
Highly Efficient ◽  
Maximum Current ◽  
Low Efficiency

Herein, two efficient yellow iridium complexes with good electron mobility were applied in OLEDs, showing a maximum current efficiency of 106.66 cd A−1 and an external quantum efficiency of 29.7% with low efficiency roll-off.

Ultrathin Bi2O2S nanosheet near-infrared photodetectors

Nanoscale ◽  
2020 ◽  
Vol 12 (30) ◽  
pp. 16285-16291 ◽  
Author(s):  
Basant Chitara ◽  
Tej B. Limbu ◽  
Jason D. Orlando ◽  
Yongan Tang ◽  
Fei Yan
Keyword(s):  
Quantum Efficiency ◽  
Dark Current ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
High Efficiency ◽  
Infrared Photodetectors ◽  
Current Ratio ◽  
Solution Processed

Solution-processed Bi2O2S nanosheets demonstrate high-efficiency NIR photodetection with a responsivity of 4 A/W, an external quantum efficiency of 630%, and a normalized photocurrent-to-dark-current ratio of 1.3 × 1010 per watt.

scholarly journals Pyridinyl-Carbazole Fragments Containing Host Materials for Efficient Green and Blue Phosphorescent OLEDs

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4615
Author(s):  
Dovydas Blazevicius ◽  
Daiva Tavgeniene ◽  
Simona Sutkuviene ◽  
Ernestas Zaleckas ◽  
Ming-Ruei Jiang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Triplet Energy ◽  
New Host ◽  
High Brightness ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Host Materials

Pyridinyl-carbazole fragments containing low molar mass compounds as host derivatives H1 and H2 were synthesized, investigated, and used for the preparation of electro-phosphorescent organic light-emitting devices (PhOLEDs). The materials demonstrated high stability against thermal decomposition with the decomposition temperatures of 361–386 °C and were suitable for the preparation of thin amorphous and homogeneous layers with very high values of glass transition temperatures of 127–139 °C. It was determined that triplet energy values of the derivatives are, correspondingly, 2.82 eV for the derivative H1 and 2.81 eV for the host H2. The new derivatives were tested as hosts of emitting layers in blue, as well as in green phosphorescent OLEDs. The blue device with 15 wt.% of the iridium(III)[bis(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) emitter doping ratio in host material H2 exhibited the best overall characteristics with a power efficiency of 24.9 lm/W, a current efficiency of 23.9 cd/A, and high value of 10.3% of external quantum efficiency at 100 cd/m2. The most efficient green PhOLED with 10 wt% of Ir(ppy)3 {tris(2-phenylpyridine)iridium(III)} in the H2 host showed a power efficiency of 34.1 lm/W, current efficiency of 33.9 cd/A, and a high value of 9.4% for external quantum efficiency at a high brightness of 1000 cd/m2, which is required for lighting applications. These characteristics were obtained in non-optimized PhOLEDs under an ordinary laboratory atmosphere and could be improved in the optimization process. The results demonstrate that some of the new host materials are very promising components for the development of efficient phosphorescent devices.

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