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1.4% External Quantum Efficiency 988 nm Light Emitting Diode Based on Tin-Lead Halide Perovskite.
Adv Mater
December 2024
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 3, Groningen, 9747 AG, The Netherlands.
In recent years, metal halide perovskite-based light-emitting diodes (LEDs) have garnered significant attention as they display high quantum efficiency, good spectral tunability, and are expected to have low processing costs. When the peak emission wavelength is beyond 900 nm the interest is even higher because of the critical importance of this wavelength for biomedical imaging, night vision, and sensing. However, many challenges persist in fabricating these high-performance NIR LEDs, particularly for wavelengths above 950 nm, which appear to be limited by low radiance and poor stability.
View Article and Find Full Text PDFBroadband Shortwave Infrared-Emitting Cr- and Ni-Codoped YAlGaO Phosphor with Excellent Thermal Stability for Multifunctional Applications.
ACS Appl Mater Interfaces
January 2025
Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
Shortwave infrared (SWIR)-emitting materials have emerged as superior light sources with increasing demand for potential applications in noninvasive analysis, night vision illumination, and medical diagnosis. For developing next-generation SWIR phosphor-converted light-emitting diodes (pc-LEDs), the scarcity of intense blue-light-pumped broadband SWIR luminescent materials and poor thermal stability of current Ni-activated phosphors are the ongoing challenges. Here, a blue-light-excitable (440 nm) YAlGaO:Cr,Ni phosphor with ultrawide SWIR emission centered at ∼1430 nm (FWHM ∼264 nm) is reported.
View Article and Find Full Text PDFCa/Si Modification of the (Gd,Lu)AG Garnet for Enhanced Broadband Cr Luminescence of High Thermal Stability.
Inorg Chem
December 2024
Research Center for Optical and Electronic Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
Article Synopsis
- Near-infrared (NIR) phosphors are essential for enhancing the efficiency and stability of NIR-pc LEDs, with new phosphors designed based on garnet-structured compounds.
- The study identified the optimal chromium content for these phosphors and demonstrated significant improvements in luminescence and quantum efficiency through the substitution of Ca and Si ions.
- The resulting NIR pc-LED device shows promise for practical applications in night vision and medical diagnostics due to its high performance and thermal stability.
User Perceptions of Wearability of Knitted Sensor Garments for Long-Term Monitoring of Breathing Health: Thematic Analysis of Focus Groups and a Questionnaire Survey.
JMIR Biomed Eng
December 2024
WSA E-Textile Innovation Lab, Winchester School of Art, University of Southampton, Winchester, United Kingdom.
Background: Long-term unobtrusive monitoring of breathing patterns can potentially give a more realistic insight into the respiratory health of people with asthma or chronic obstructive pulmonary disease than brief tests performed in medical environments. However, it is uncertain whether users would be willing to wear these sensor garments long term.
Objective: Our objective was to explore whether users would wear ordinary looking knitted garments with unobtrusive knitted-in breathing sensors long term to monitor their lung health and under what conditions.
Ultrabroadband Visible-Near-Infrared Phosphor CaYMgGeO:Ce/Cr and Its Temperature Sensing.
Inorg Chem
December 2024
Department of Physics, Georgia Southern University, Statesboro, Georgia 30460, United States.
With the wide application of phosphor conversion light-emitting diode (pc-LED) in nondestructive testing, spectral illumination, near-infrared (NIR) spectroscopy, agricultural medical care, and other fields, the ultrabroadband visible-NIR tunable emission phosphor is considered as the most promising fluorescent material. In this paper, Ce/Cr single-doped and codoped CaYMgGeO phosphors were successfully prepared by using the high-temperature solid-state method. Ce and Cr codoped phosphors show ultrabroadband visible-NIR emission from 480 to 900 nm with two emission peaks at visible 556 nm and infrared 758 nm.
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