Light emitting diodes: the future lighting source with high efficiency

The high efficiency, simple driving, environmental protection and long life of high power white-light diodes have attracted a lot of attention from industry and academia. High-efficiency white LEDs have the potential to replace traditional lighting such as incandescent bulbs and fluorescent lamps, and can be used in residential environments, industry and commercial advertising. Because of the advantages of light-emitting diodes, such as power saving, environmental protection, long life and fast response time, they will replace traditional light-emitting elements as the new lighting source in the future. Under the restrictions and regulations of the Kyoto Protocol, we will cooperate with the country to actively promote energy-saving technology and energy industry in the future. This paper proposes the development of LED lighting and photovoltaic, and the application of solar photovoltaic systems to bicycles, in line with the green technology industry LED lighting and solar photovoltaic industry development. Energy-saving LEDs can be combined with stand-alone lighting systems to enable the sustainable development of renewable energy development and energy conservation policies in Taiwan. Keywords: Solar cells, Light-emitting diodes, LED lamp drivers, White LEDs.

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Universal host materials for red, green and blue high-efficiency single-layer phosphorescent organic light-emitting diodes

Journal of Materials Chemistry C ◽

10.1039/d0tc04650g ◽

2020 ◽

Vol 8 (46) ◽

pp. 16354-16367

Author(s):

Fabien Lucas ◽

Cassandre Quinton ◽

Sadiara Fall ◽

Thomas Heiser ◽

Denis Tondelier ◽

...

Keyword(s):

High Efficiency ◽

Light Emitting Diodes ◽

Single Layer ◽

Organic Light Emitting Diodes ◽

Device Structure ◽

Organic Electronic ◽

Light Emitting ◽

Organic Light ◽

Host Materials ◽

The Future

As simplifying the device structure is a key step for the future of organic electronic, we report herein high efficiency universal host materials for red, green and blue Single-Layer Phosphorescent OLEDs.

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High Efficiency Green Quantum Dot Light-Emitting Diodes with Surface-treated Indium Phosphide

Proceedings of the International Display Workshops ◽

10.36463/idw.2019.oledp2-4 ◽

2019 ◽

pp. 940

Author(s):

Wei Jiang ◽

Hee Yeop Chae

Keyword(s):

Quantum Dot ◽

Indium Phosphide ◽

High Efficiency ◽

Light Emitting Diodes ◽

Light Emitting

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Dendritic Self-Host Phosphorescent Iridium Materials for High-Efficiency Organic Light-Emitting Diodes

Current Organic Chemistry ◽

10.2174/1385272821666170830115628 ◽

2018 ◽

Vol 22 (6) ◽

pp. 590-599 ◽

Cited By ~ 2

Author(s):

Chuang Yao ◽

Cuifeng Jiang ◽

Jinshan Wang

Keyword(s):

High Efficiency ◽

Light Emitting Diodes ◽

Organic Light Emitting Diodes ◽

Light Emitting ◽

Organic Light

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High-efficiency, long-lifetime deep-blue organic light-emitting diodes

Nature Photonics ◽

10.1038/s41566-021-00763-5 ◽

2021 ◽

Vol 15 (3) ◽

pp. 208-215 ◽

Cited By ~ 1

Author(s):

Soon Ok Jeon ◽

Kyung Hyung Lee ◽

Jong Soo Kim ◽

Soo-Ghang Ihn ◽

Yeon Sook Chung ◽

...

Keyword(s):

High Efficiency ◽

Light Emitting Diodes ◽

Organic Light Emitting Diodes ◽

Light Emitting ◽

Deep Blue ◽

Organic Light ◽

Long Lifetime

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High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

Nature Communications ◽

10.1038/s41467-021-25135-z ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Maria Vasilopoulou ◽

Abd. Rashid bin Mohd Yusoff ◽

Matyas Daboczi ◽

Julio Conforto ◽

Anderson Emanuel Ximim Gavim ◽

...

Keyword(s):

High Efficiency ◽

Light Emitting Diodes ◽

High Mobility ◽

Organic Light Emitting Diodes ◽

Triplet Energy ◽

Material Interface ◽

Light Emitting ◽

Thermally Activated ◽

Organic Light ◽

Hole Transporting

AbstractBlue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

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Efficient and large-area all vacuum-deposited perovskite light-emitting diodes via spatial confinement

Nature Communications ◽

10.1038/s41467-021-25093-6 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Peipei Du ◽

Jinghui Li ◽

Liang Wang ◽

Liang Sun ◽

Xi Wang ◽

...

Keyword(s):

High Resolution ◽

Large Scale ◽

High Efficiency ◽

Light Emitting Diodes ◽

Scale Production ◽

Nonradiative Recombination ◽

Large Area ◽

Spatial Confinement ◽

Light Emitting ◽

Large Scale Production

AbstractWith rapid advances of perovskite light-emitting diodes (PeLEDs), the large-scale fabrication of patterned PeLEDs towards display panels is of increasing importance. However, most state-of-the-art PeLEDs are fabricated by solution-processed techniques, which are difficult to simultaneously achieve high-resolution pixels and large-scale production. To this end, we construct efficient CsPbBr3 PeLEDs employing a vacuum deposition technique, which has been demonstrated as the most successful route for commercial organic LED displays. By carefully controlling the strength of the spatial confinement in CsPbBr3 film, its radiative recombination is greatly enhanced while the nonradiative recombination is suppressed. As a result, the external quantum efficiency (EQE) of thermally evaporated PeLED reaches 8.0%, a record for vacuum processed PeLEDs. Benefitting from the excellent uniformity and scalability of the thermal evaporation, we demonstrate PeLED with a functional area up to 40.2 cm2 and a peak EQE of 7.1%, representing one of the most efficient large-area PeLEDs. We further achieve high-resolution patterned perovskite film with 100 μm pixels using fine metal masks, laying the foundation for potential display applications. We believe the strategy of confinement strength regulation in thermally evaporated perovskites provides an effective way to process high-efficiency and large-area PeLEDs towards commercial display panels.

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