Spectrally tunable and thermally stable near-infrared luminescence in Na3Sc2(PO4)3:Cr3+ phosphor by Ga3+ co-doping for light-emitting diodes

2021 ◽  
Author(s):  
Shihai Miao ◽  
Yanjie Liang ◽  
Yan Zhang ◽  
Dongxun Chen ◽  
Shao Yan ◽  
...  
Keyword(s):  
High Power ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Sources ◽  
Thermally Stable ◽  
Light Emitting ◽  
Co Doping ◽  
Nir Light ◽  
Infrared Luminescence ◽  
Promising Solution

Near-infrared (NIR) phosphor-converted light-emitting diodes (LEDs) are becoming an efficient and promising solution for high-power NIR light sources, which have shown a broad range of possible applications in the fields...

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 Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0

2020 ◽  
Vol 16 ◽  
pp. 415-444 ◽  
Author(s):  
Bernd Strehmel ◽  
Christian Schmitz ◽  
Ceren Kütahya ◽  
Yulian Pang ◽  
Anke Drewitz ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
High Power ◽  
Near Infrared ◽  
New Technologies ◽  
Light Sources ◽  
Hydrophobic Properties ◽  
On Demand ◽  
Nir Light ◽  
Photothermal Treatment ◽  
End Groups

Cyanines derived from heptamethines were mainly discussed regarding their functionalization to broaden the solubility in different surroundings exhibiting either hydrophilic or hydrophobic properties and to tailor made the ΔG et photopysical properties with respect to absorption and fluorescence. Electrochemical properties were additionally considered for some selected examples. The cyanines chosen comprised as end groups either indolenine, benzo[e]- or benzo[cd]indolium pattern, which facilitated to shift the absorption between 750–1000 nm. This enabled their use in applications with light sources emitting in the near-infrared (NIR) region selected from high power LEDs or lasers with line-shaped focus. The absorbers considered were discussed regarding their function as sensitizer for applications related to Chemistry 4.0 standards. These were mainly photopolymer coatings, which can be found for applications in the graphic industry or to protect selected substrates. The huge release of heat on demand upon turning ON or OFF the NIR light source enables them for photothermal treatment in processes requesting heat to initiate either chemical (activated reactions) or physical (melting, evaporation) events.

Light-emitting diodes as light sources for spectroscopy: Sensitivity to temperature

2017 ◽  
Vol 25 (6) ◽  
pp. 416-422 ◽  
Author(s):  
Clinton J Hayes ◽  
Kerry B Walsh ◽  
Colin V Greensill
Keyword(s):  
Ambient Temperature ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Junction Temperature ◽  
Effect Of Temperature ◽  
Light Sources ◽  
Spectral Variation ◽  
Light Emitting ◽  
Full Intensity

Understanding of light-emitting diode lamp behaviour is essential to support the use of these devices as illumination sources in near infrared spectroscopy. Spectral variation in light-emitting diode peak output (680, 700, 720, 735, 760, 780, 850, 880 and 940 nm) was assessed over time from power up and with variation in environmental temperature. Initial light-emitting diode power up to full intensity occurred within a measurement cycle (12 ms), then intensity decreased exponentially over approximately 6 min, a result ascribed to an increase in junction temperature as current is passed through the light-emitting diode. Some light-emitting diodes displayed start-up output characteristics on their first use, indicating the need for a short light-emitting diode ‘burn in’ period, which was less than 24 h in all cases. Increasing the ambient temperature produced a logarithmic decrease in overall intensity of the light-emitting diodes and a linear shift to longer wavelength of the peak emission. This behaviour is consistent with the observed decrease in the IAD Index (absorbance difference between 670 nm and 720 nm, A670–A720) with increased ambient temperature, as measured by an instrument utilising light-emitting diode illumination (DA Meter). Instruments using light-emitting diodes should be designed to avoid or accommodate the effect of temperature. If accommodating temperature, as light-emitting diode manufacturer specifications are broad, characterisation is recommended.

High-Power GaN-Based Light-Emitting Diodes Using Thermally Stable and Highly Reflective Nano-Scaled Ni–Ag–Ni–Au Mirror

2011 ◽  
Vol 23 (22) ◽  
pp. 1685-1687 ◽  
Author(s):  
Inchan Ju ◽  
Yongwook Kwon ◽  
Chan-Soo Shin ◽  
Ka Hee Kim ◽  
Seong-Ju Bae ◽  
...  
Keyword(s):  
High Power ◽  
Light Emitting Diodes ◽  
Thermally Stable ◽  
Light Emitting

scholarly journals A Retrofitted Metallurgical Microscope Using Light Emitting Diodes for Multi-Spectral Imaging

2017 ◽  
Vol 11 (9) ◽  
pp. 30 ◽  
Author(s):  
Jerry Opoku-Ansah ◽  
Benjamin Anderson ◽  
Moses J. Eghan ◽  
Peter Osei-Wusu Adueming ◽  
Charles L.Y. Amuah ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Scientific Research ◽  
Spectral Imaging ◽  
Acquisition Time ◽  
Light Sources ◽  
Extreme Pressure ◽  
Light Emitting ◽  
Research Fields ◽  
Entomological Research

Multi-spectral imaging (MSI) has made diagnosis of microscopic samples considerably easier and information abound. Most MSI systems use continuum light sources and filters for imaging purposes. However, these light sources and filters are relatively expensive, unstable due to extreme pressure and temperature and associated with prolong acquisition time. In this work, we present a metallurgical microscope retrofitted with light-emitting diodes (LEDs) as illumination sources for MSI microscopy. This multispectral LED imaging microscope (MSLEDIM) is relatively cheaper and capable of acquiring images in reflection, transmission and scattering modes at thirteen (13) different wavelengths ranging from ultraviolet to near infrared. The microscope has been demonstrated in biomedical and entomological research fields. The MSLEDIM can be used in various scientific research fields for imaging microscopic samples.

A highly efficient and thermally stable broadband Cr3+-activated double borate phosphor for near-infrared light-emitting diodes

2021 ◽  
Vol 9 (1) ◽  
pp. 164-172
Author(s):  
Decai Huang ◽  
Haomiao Zhu ◽  
Zhonghua Deng ◽  
Hongyi Yang ◽  
Jie Hu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Agricultural Products ◽  
Infrared Light ◽  
Thermally Stable ◽  
Nondestructive Analysis ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Highly Efficient

GdAl3(BO3)4:Cr3+ is used to fabricate a NIR-pc-LED that shows promise for plant lighting and applications in the nondestructive analysis of agricultural products.

Design of Broadband Near-Infrared Y0.57La0.72Sc2.71 (BO3)4:Cr3+ Phosphors Based on One-Site Occupation and Its Application in NIR Light-Emitting Diodes

2021 ◽  
Author(s):  
Haiyan Wu ◽  
Lihong Jiang ◽  
Kai Li ◽  
Chengyu Li ◽  
Hongjie Zhang
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Agricultural Products ◽  
Light Emitting ◽  
Site Occupation ◽  
Nir Light ◽  
Non Destructive

Recently, near-infrared (NIR) phosphor converted light-emitting diodes (pc-LEDs) have attracted much attention due to its applications in non-destructive detection of the quality of agricultural products and the non-destructive monitoring of...

Efficient polymer light-emitting diodes (PLEDs) based on chiral [Pt(C^N)(N^O)] complexes with near-infrared (NIR) luminescence and circularly polarized (CP) light

2019 ◽  
Vol 7 (44) ◽  
pp. 13743-13747 ◽  
Author(s):  
Guorui Fu ◽  
Yani He ◽  
Wentao Li ◽  
Baowen Wang ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Emitters ◽  
Light Emitting ◽  
Circularly Polarized ◽  
Nir Light ◽  
Polymer Light Emitting Diodes ◽  
Nir Luminescence

Chiral NIR-light emitters [Pt(iqbt)(S-Ln)] (1–4) were used as dopants to produce CP-NIR-PLEDs displaying λem of 732 nm, ηMaxEQE of 0.87–0.93%, and gEL of up to 10−3.

scholarly journals EFFECT OF NEAR-INFRARED LIGHT IRRADIATION ON WOUND HEALING USING HIGH POWER LIGHT EMITTING DIODES

1984 ◽  
Vol 4 (1) ◽  
pp. 187-188 ◽  
Author(s):  
Shinro MASHIKO ◽  
Masayoshi SHIMAMOTO ◽  
Humio INABA ◽  
Yoshio TAGUCHI ◽  
Itaru OHARA ◽  
...  
Keyword(s):  
Wound Healing ◽  
High Power ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Light Irradiation ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Light Emitting

Broadband near-infrared emission of La3Ga5GeO14:Tb3+,Cr3+ phosphors: energy transfer, persistent luminescence and application in NIR light-emitting diodes

2020 ◽  
Vol 8 (34) ◽  
pp. 11760-11770
Author(s):  
Biao Bai ◽  
Peipei Dang ◽  
Zhongli Zhu ◽  
Hongzhou Lian ◽  
Jun Lin
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Infrared Emission ◽  
Persistent Luminescence ◽  
Light Emitting ◽  
Nir Light ◽  
Near Infrared Emission

A broadband near-infrared La3Ga5GeO14:Tb3+,Cr3+ phosphor with high efficiency was achieved via design of energy transfer for NIR LEDs.

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