Efficient Super Broadband NIR Ca₂LuZr₂Al₃O₁₂:Cr³⁺,Yb³⁺ Garnet Phosphor for pc‐LED Light Source toward NIR Spectroscopy Applications

Advanced Optical Materials, Journal Year: 2020, Volume and Issue: 8(6)

Published: Jan. 17, 2020

Abstract Super broadband near‐infrared (NIR) phosphor converted light‐emitting diodes (pc‐LEDs) are future light sources in NIR spectroscopy applications such as food testing. At present, a few blue LED excitable super phosphors (bandwidth > 300 nm) have been developed producing the output powers below 26 mW at 100 mA input current after packaging. Here, an efficient achieved by doping Yb 3+ is reported Ca 2 LuZr Al 3 O 12 :Cr (CLZA:Cr ) garnet previously. Benefited from superposition of Cr emission and highly excited energy transfer , codoped CLZA:Cr ,Yb shows bandwidth 320 nm internal quantum efficiency 77.2% both higher than that (150 69.1%) singly doped phosphor. The converts produced 41.8 current. pc‐LED source also well applied to transmission spectra measurement water. results indicate great potential applications.

Language: Английский

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An Ultraviolet–Visible and Near‐Infrared‐Responded Broadband NIR Phosphor and Its NIR Spectroscopy Application

Advanced Optical Materials, Journal Year: 2020, Volume and Issue: 8(8)

Published: Feb. 23, 2020

Abstract High‐radiance near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) are demanded for wearable biosensing devices and the properties of these pc‐LEDs highly dependent on performance NIR phosphor. An ultraviolet–visible NIR‐responded broadband NaScGe 2 O 6 :Cr 3+ phosphor is reported. Under 490 nm excitation, shows broad emission band from 700 to 1250 nm, which covers first second windows. pc‐LED with radiant flux 12.07 mW@350 mA realized based 450 blue LED chip. The ability high‐power light penetrate human tissues observed successfully. Additionally, in , luminescence Cr under 808 laser excitation achieved time.

Language: Английский

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Simultaneous Broadening and Enhancement of Cr³⁺Photoluminescence in LiIn₂SbO₆by Chemical Unit Cosubstitution: Night‐Vision and Near‐Infrared Spectroscopy Detection Applications

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(26), P. 14644 - 14649

Published: April 6, 2021

Abstract Near‐infrared (NIR)‐emitting phosphor materials have been extensively developed for optoelectronic and biomedical applications. Although Cr 3+ ‐activated phosphors widely reported, it is challenging to achieve ultra‐broad tunable NIR emission. Here, a new ultra‐broadband NIR‐emitting LiIn 2 SbO 6 :Cr with emission peak at 965 nm full‐width half maximum of 217 reported. Controllable tuning from 892 achieved by chemical unit cosubstitution [Zn 2+ –Zn ] [Li + –In ], which can be ascribed the upshift 4 T 2g energy level due strengthened crystal field. Moreover, greatly enhanced, FWHM reaches 235 nm. The as‐prepared luminescent demonstrated potential in night‐vision spectroscopy techniques. This work proves feasibility strategy ‐doped phosphors, stimulate further studies on emission‐tunable materials.

Language: Английский

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Heavy Mn²⁺ Doped MgAl₂O₄ Phosphor for High‐Efficient Near‐Infrared Light‐Emitting Diode and the Night‐Vision Application

Advanced Optical Materials, Journal Year: 2019, Volume and Issue: 7(24)

Published: Sept. 23, 2019

Abstract Photoluminescence originated from doped activators in the solid state materials usually faces challenge of concentration quenching, restricting further increase photoluminescence intensity. Herein, a new strategy is demonstrated by heavy doping Mn 2+ into MgAl 2 O 4 , leading to broad‐band near‐infrared (NIR) emission peaking at ≈825 nm with full width half maximum ≈125 nm, as well high internal quantum efficiency ≈53% upon 450 laser excitation. Density functional theory calculation and extend X‐ray absorption fine structure provide understanding Al 3+ /Mn disorder –Mn aggregation spinel Mg 1–x : x content, which enables formation superexchange coupled IV – VI pair. The NIR light‐emitting diodes fabricated blue chip 0.50 :0.50Mn phosphor gives output power ≈78.41 mW under driven current 120 mA, night‐vision application light source dark demonstrated. This work opens paths for rational design efficient emitting phosphor, also provides insights luminescence applications.

Language: Английский

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A broadband cyan-emitting Ca₂LuZr₂(AlO₄)₃:Ce³⁺ garnet phosphor for near-ultraviolet-pumped warm-white light-emitting diodes with an improved color rendering index

Journal of Materials Chemistry C, Journal Year: 2019, Volume and Issue: 8(3), P. 1095 - 1103

Published: Nov. 29, 2019

Broadband cyan-emitting Ca₂LuZr₂(AlO₄)₃:Ce³⁺ garnet phosphors enabled to fill the cyan gap in emission spectra of near-ultraviolet-pumped warm-white LEDs, thus resulting improved color rendering index.

Language: Английский

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Highly efficient near-infrared phosphor LaMgGa₁₁O₁₉:Cr³⁺

Inorganic Chemistry Frontiers, Journal Year: 2020, Volume and Issue: 7(6), P. 1467 - 1473

Published: Jan. 1, 2020

LaMgGa₁₁O₁₉:Cr³⁺ phosphor was synthesized successfully, showing broadband NIR emission centered at ∼770 nm, high efficiency and excellent thermal quenching resistance for pc-LEDs.

Language: Английский

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Cr³⁺‐Doped Sc‐Based Fluoride Enabling Highly Efficient Near Infrared Luminescence: A Case Study of K₂NaScF₆:Cr³⁺

Laser & Photonics Review, Journal Year: 2020, Volume and Issue: 15(2)

Published: Dec. 23, 2020

Abstract The development of highly efficient and thermally stable broadband near‐infrared (NIR) luminescence materials is a great challenge to advance the next‐generation smart NIR light source. Benefitting from low phonon energy relatively weak electron coupling effect fluoride, K 2 NaScF 6 :Cr 3+ phosphor designed obtained, which demonstrates full width at half maximum 100 nm peaking ≈765 nm. Upon blue excitation, exhibits high quantum efficiency 74% its emission intensity 150 °C can keep 89.6% initial value 25 °C. An output power 159.72 mW (input electric power, 1094 mW) with photoelectric conversion ≈14.60%, light‐emitting diode (LED) device presented based on this phosphor. Furthermore, applying high‐power phosphor‐converted LED as lighting source, clear quick veins imaging recognition in fingers, palm, wrist, arm human hand are first realized, suggesting has promise practical applications.

Language: Английский

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Broadband near-infrared (NIR) emission realized by the crystal-field engineering of Y_3−xCa_xAl_5−xSi_xO₁₂:Cr³⁺(x= 0–2.0) garnet phosphors

Journal of Materials Chemistry C, Journal Year: 2019, Volume and Issue: 8(6), P. 1981 - 1988

Published: Dec. 12, 2019

Broadband NIR emission with high IQE was realized by crystal-field engineering of Y₂CaAl₄SiO₁₂:Cr.

Language: Английский

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Trivalent Chromium Ions Doped Fluorides with Both Broad Emission Bandwidth and Excellent Luminescence Thermal Stability

ACS Applied Materials & Interfaces, Journal Year: 2021, Volume and Issue: 13(15), P. 18274 - 18282

Published: April 8, 2021

Recently, trivalent chromium ion doped phosphors have exhibited significant application potential in broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs). However, developing an NIR phosphor with both broad emission bandwidth and excellent luminescence thermal stability is still a great challenge. Here, we demonstrate phosphor, ScF3:Cr3+, which can fulfill conditions simultaneously. The prepared show the range of 700 to 1100 nm, full width at half-maximum (FWHM) 140 nm peaking 853 nm. These also (the intensity ScF3:Cr3+ keeps 85.5% 150 °C compared value room temperature). An pc-LED based on blue LED chips was fabricated tested. results that yield strong emission. This work not only provides promising for pc-LEDs but has important guiding significance effect synthesis properties Cr3+-doped fluorides.

Language: Английский

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Two-site Cr³⁺ occupation in the MgTa₂O₆:Cr³⁺ phosphor toward broad-band near-infrared emission for vessel visualization

Journal of Materials Chemistry C, Journal Year: 2020, Volume and Issue: 8(27), P. 9322 - 9328

Published: Jan. 1, 2020

Cr³⁺ ions in MgTa₂O₆ located the two six-coordinated crystallographic sites of Mg²⁺ and Ta⁵⁺ enable broad-band near-infrared emission.

Language: Английский

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