Efficient near-infrared organic radical-based light-emitting diodes

2021 ◽  
Author(s):  
Hwanhee Cho ◽  
Shun Kimura ◽  
Neil C. Greenham ◽  
Tetsuro Kusamoto ◽  
Richard C. Friend ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Organic Radical ◽  
Light Emitting

Geometrically isomeric [Ir(iqbt)(ppy)(hpa)] complexes with differential molecule orientations for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs)

2021 ◽  
Vol 9 (36) ◽  
pp. 12068-12072
Author(s):  
Wentao Li ◽  
Jiaxiang Liu ◽  
Baowen Wang ◽  
Siyu Hou ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Dipole Transition ◽  
Transition Dipole ◽  
Light Emitting ◽  
Horizontal Orientation ◽  
Polymer Light Emitting Diodes

Based on geometrical isomerisation of [Ir(C^N1)(C^N2)((N^O))]-tris-heteroleptic Ir(iii)-complexes, the augmented transition dipole transition (TMD) with a preferential horizontal orientation, which is beneficial for their NIR-phosphorescence, is reported.

scholarly journals Near-infrared lead chalcogenide quantum dots: Synthesis and applications in light emitting diodes

2019 ◽  
Vol 28 (12) ◽  
pp. 128504 ◽  
Author(s):  
Haochen Liu ◽  
Huaying Zhong ◽  
Fankai Zheng ◽  
Yue Xie ◽  
Depeng Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Lead Chalcogenide ◽  
Light Emitting

scholarly journals Two-dimensional perovskites with alternating cations in the interlayer space for stable light-emitting diodes

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yiyue Zhang ◽  
Masoumeh Keshavarz ◽  
Elke Debroye ◽  
Eduard Fron ◽  
Miriam Candelaria Rodríguez González ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Interlayer Space ◽  
High Current Density ◽  
Operational Stability ◽  
Infrared Light ◽  
Two Dimensional ◽  
Commercial Development ◽  
Light Emitting

Abstract Lead halide perovskites have attracted tremendous attention in photovoltaics due to their impressive optoelectronic properties. However, the poor stability of perovskite-based devices remains a bottleneck for further commercial development. Two-dimensional perovskites have great potential in optoelectronic devices, as they are much more stable than their three-dimensional counterparts and rapidly catching up in performance. Herein, we demonstrate high-quality two-dimensional novel perovskite thin films with alternating cations in the interlayer space. This innovative perovskite provides highly stable semiconductor thin films for efficient near-infrared light-emitting diodes (LEDs). Highly efficient LEDs with tunable emission wavelengths from 680 to 770 nm along with excellent operational stability are demonstrated by varying the thickness of the interlayer spacer cation. Furthermore, the best-performing device exhibits an external quantum efficiency of 3.4% at a high current density (J) of 249 mA/cm2 and remains above 2.5% for a J up to 720 mA cm−2, leading to a high radiance of 77.5 W/Sr m2 when driven at 6 V. The same device also shows impressive operational stability, retaining almost 80% of its initial performance after operating at 20 mA/cm2 for 350 min. This work provides fundamental evidence that this novel alternating interlayer cation 2D perovskite can be a promising and stable photonic emitter.

Electrically driven single microribbon based near-infrared exciton-polariton light-emitting diode

CrystEngComm ◽  
2021 ◽  
Author(s):  
Mingming Jiang ◽  
Fupeng Zhang ◽  
Kai Tang ◽  
Peng Wan ◽  
Caixia Kan
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Light Sources ◽  
Coherent Light ◽  
Light Emitting ◽  
Exciton Polaritons ◽  
Laser Devices

Achieving electrically-driven exciton-polaritons has drawn substantial attention toward developing ultralow-threshold coherent light sources, containing polariton laser devices and high-performance light-emitting diodes (LEDs). In this work, we demonstrate an electrically driven...

scholarly journals Amelioration of oral mucositis pain by NASA near-infrared light-emitting diodes in bone marrow transplant patients

2011 ◽  
Vol 20 (7) ◽  
pp. 1405-1415 ◽  
Author(s):  
Brian D. Hodgson ◽  
David M. Margolis ◽  
Donna E. Salzman ◽  
Dan Eastwood ◽  
Sergey Tarima ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Bone Marrow Transplant ◽  
Oral Mucositis ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Marrow Transplant ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Transplant Patients

Efficient near-infrared organic light-emitting diodes based on a bipolar host

2018 ◽  
Vol 6 (6) ◽  
pp. 1407-1412 ◽  
Author(s):  
Yun Hu ◽  
Yi Yuan ◽  
Ying-Li Shi ◽  
Jiu-Dong Lin ◽  
Zuo-Quan Jiang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Emission Peak ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Type Host ◽  
Organic Light ◽  
Donor Acceptor

A maximum EQE of 2.7% with an emission peak of 735 nm was achieved by employing a donor–acceptor type host 5-(4-(diphenylamino)phenyl)acenaphthylene-1,2-dione (ADO-TPA).

With single luminescence center ultra-broadband near-infrared LiScGeO4:Cr phosphor for biological tissue penetration

2021 ◽  
Author(s):  
Zejun Ye ◽  
Zhijun Wang ◽  
Qian Wu ◽  
Xiaoxue Huo ◽  
Huifang Yang ◽  
...  
Keyword(s):  
Biological Tissue ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Luminescence Center ◽  
Tissue Penetration ◽  
Light Emitting ◽  
Broadband Emission

In this work, in order to meet the application of near-infrared phosphor-converted light emitting diodes (pc-LEDs), an ultra-broadband emission phosphor LiScGeO4:Cr phosphor was synthesized, and its FWHM reached 335 nm,...

scholarly journals Growth and Photomorphogenesis of Pepper Plants under Red Light-emitting Diodes with Supplemental Blue or Far-red Lighting

1995 ◽  
Vol 120 (5) ◽  
pp. 808-813 ◽  
Author(s):  
Christopher S. Brown ◽  
Andrew C. Schuerger ◽  
John C. Sager
Keyword(s):  
Infrared Radiation ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Plant Biomass ◽  
Dry Matter Partitioning ◽  
Light Emitting ◽  
Culture Systems ◽  
Plant Culture ◽  
Red Leds ◽  
Red Radiation

Light-emitting diodes (LEDs) are a potential irradiation source for intensive plant culture systems and photobiological research. They have small size, low mass, a long functional life, and narrow spectral output. In this study, we measured the growth and dry matter partitioning of `Hungarian Wax' pepper (Capsicum annum L.) plants grown under red LEDs compared with similar plants grown under red LEDs with supplemental blue or far-red radiation or under broad spectrum metal halide (MH) lamps. Additionally, we describe the thermal and spectra1 characteristics of these sources. The LEDs used in this study had a narrow bandwidth at half peak height (25 nm) and a focused maximum spectral output at 660 nm for the red and 735 nm for the far-red. Near infrared radiation (800 to 3000 nm) was below detection and thermal infrared radiation (3000 to 50,000 nm) was lower in the LEDs compared to the MH source. Although the red to far-red ratio varied considerably, the calculated phytochrome photostationary state (φ) was only slightly different between the radiation sources. Plant biomass was reduced when peppers were grown under red LEDs in the absence of blue wavelengths compared to plants grown under supplemental blue fluorescent lamps or MH lamps. The addition of far-red radiation resulted in taller plants with greater stem mass than red LEDs alone. There were fewer leaves under red or red plus far-red radiation than with lamps producing blue wavelengths. These results indicate that red LEDs may be suitable, in proper combination with other wavelengths of light, for the culture of plants in tightly controlled environments such as space-based plant culture systems.

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