Structural Confinement toward Controlling Energy Transfer Path for Enhancing Near-Infrared Luminescence

Zhao, Feng Qing; Cai, Hao; Song, Zhitang; Liu, Quanlin

doi:10.1021/acs.chemmater.1c02734

Cited by 58 publications

(66 citation statements)

References 43 publications

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“…Nevertheless, the blue light absorption ability of Yb 3+ is significantly weak due to the absence of energy levels in the blue region, making it hard to achieve high-efficient SWIR luminescence by the use of readily available and high-power blue LED chips. Just recently, Yb 3+ has been co-doped into Cr 3+ -activated broadband NIR-emitting phosphors to broaden the spectral bandwidth and improve the NIR luminescence performance in view of the efficient Cr 3+ →Yb 3+ energy transfer under the excitation of blue LED 40 – 45 . However, with regard to this application, Cr 3+ emission and Yb 3+ emission usually appear simultaneously with comparable luminescence intensities in order to achieve super broadband NIR LED application, while the intense and dominant emission band over 940–1200 nm from Yb 3+ for SWIR LEDs and their practical applications have largely gone unnoticed.…”

Section: Introductionmentioning

confidence: 99%

Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors

et al. 2022

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The growing demand for spectroscopy applications in the areas of agriculture, retail and healthcare has led to extensive research on infrared light sources. The ability of phosphors to absorb blue light from commercial LED and convert the excitation energy into long-wavelength infrared luminescence is crucial for the design of cost-effective and high-performance phosphor-converted infrared LEDs. However, the lack of ideal blue-pumped short-wave infrared (SWIR) phosphors with an emission peak longer than 900 nm greatly limits the development of SWIR LEDs using light converter technology. Here we have developed a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability by co-doping Cr3+-Yb3+ ion pairs into Lu0.2Sc0.8BO3 host materials. Benefitting from strong light absorption of Cr3+ in the blue waveband and very efficient Cr3+→Yb3+ energy transfer, the as-synthesized Lu0.2Sc0.8BO3:Cr3+,Yb3+ phosphor emits intense SWIR light in the 900–1200 nm from Yb3+ under excitation with blue light at ~460 nm. The optimized phosphor presents an internal quantum yield of 73.6% and the SWIR luminescence intensity at 100 °C can still keep 88.4% of the starting value at 25 °C. SWIR LED prototype device based on Lu0.2Sc0.8BO3:Cr3+,Yb3+ phosphor exhibits exceptional luminescence performance, delivering SWIR radiant power of 18.4 mW with 9.3% of blue-to-SWIR power conversion efficiency and 5.0% of electricity-to-SWIR light energy conversion efficiency at 120 mA driving current. Moreover, under the illumination of high-power SWIR LED, covert information identification and night vision lighting have been realized, demonstrating a very bright prospect for practical applications.

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Section: Introductionmentioning

confidence: 99%

Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors

et al. 2022

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“…Yb 3+ ion can make up for the spectral deficiency of Cr 3+ emission beyond 950 nm by generating an additional emission band centered at ≈1000 nm via Cr 3+ -to-Yb 3+ ET. [3,5,7,[26][27][28] Nevertheless, current Cr 3+ -based NIR phosphors still encounter unsatisfactory bandwidth, thermal stability, and internal/external quantum efficiency (IQE/EQE), which limits their applications in practical settings.…”

Section: Introductionmentioning

confidence: 99%

“…Near-infrared (NIR) spectroscopic technique has emerged as a promising nondestructive tool for medical diagnosis as well as industrial inspection in modern agriculture, food industry, and pharmaceutics. [1][2][3][4][5] These applications are heavily reliant on high-performance NIR light sources with emissions in the wavelength range of 700-1000 nm. NIR phosphors-converted light-emitting diodes (pc-LED) activated by commercial blue chips are one of the ideal light sources owing to their features of low cost, compact size, high energy efficiency, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Rapid Nondestructive Detection Enabled by an Ultra‐Broadband NIR pc‐LED

Suo

Wang

Zhao

et al. 2022

Laser & Photonics Reviews

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The rapid development of near‐infrared (NIR) spectroscopic techniques has greatly stimulated the discovery of novel broadband NIR‐emitting phosphors as advanced light sources. Herein, a novel double‐perovskite phosphor La2MgHfO6:Cr3+/Yb3+ that displays ultra‐broadband NIR emissions with a full‐width at half maximum (FWHM) of 333 nm is reported. The remarkable luminescence property stems from the multiple crystallographic sites, relatively weak crystal field, and efficient Cr3‐to‐Yb3+ energy transfer (ET). The site occupation of Cr3+ is elaborately verified by the Rietveld refinement and first‐principles calculation. By controlling the ET process, the internal/external quantum efficiency (IQE/EQE), bandwidth, and thermal stability of NIR emissions are substantially improved. The as‐prepared phosphors are further integrated into a miniaturized NIR light‐emitting diode (LED) package, demonstrating superior performance in rapid nondestructive detection of structural failure in thin electronic cables. The results described here provide a novel pointcut for designing broadband NIR‐emitting phosphors with desired optical properties toward applications in industrial inspection and medical diagnosis.

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“…(Figure S2b, Supporting Information) the formed oxygen vacancy V O can serve as a trapping center for electrons in the conduction band, and the initial rise of zero thermal quenching is mainly achieved by this charge‐energy level compensation (simplified model schematic is placed in Figure S9, Supporting Information). [ 4,29,38 ]…”

Section: Resultsmentioning

confidence: 99%

“…[28] Although Cr 3+ and Yb 3+ codoping effectively widens the FWHM and enhances thermal stability, the improvement of IQE is still very limited. [29] The main reason for this can be explained as follows. In the most Cr 3+ and Yb 3+ codoped phosphors, few cases can form stable and compact Cr-Yb ET pairs, which leads to a large amount of energy loss of Cr 3+ ions due to the non-radiative transition and simultaneous ET to Yb 3+ ions, resulting in a rapid energy decay of Cr 3+ , making it difficult to improve the overall IQE effectively.…”

Section: Doi: 101002/adom202201076mentioning

confidence: 99%

Enhancement of Near‐Infrared Phosphor Luminescence Properties via Construction of Stable and Compact Energy Transfer Paths

Wei

Wang

et al. 2022

Advanced Optical Materials

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The rapid development of near‐infrared (NIR) spectroscopy urgently requires the exploration of NIR‐emitting phosphors with excellent luminescence properties. Herein, GaTaO4:Cr3+,Yb3+ NIR phosphor with excellent luminescence properties is reported, which exhibits ultra‐broadband NIR emission with a full width at half maximum of 300 nm, good thermal stability of 90%@423 K, and most remarkably, high internal quantum efficiency of 95.5% and external quantum efficiency of 44.79%. Such outstanding luminescence properties mainly give the credit to the unique sandwiched structure of GaTaO4:Cr3+,Yb3+, in which layers of Yb3+ ions (activator) are sandwiched between layers of Cr3+ ions (sensitizer), and hence many stable and compact Cr–Yb pairs are formed, so that the energy can be rapidly transferred from Cr3+ to Yb3+, effectively activating the characteristic f–f transition of Yb3+ that is very stable and almost independent of the temperature, and at the same time, the non‐radiative transition of Cr3+ ions can be suppressed to a certain degree. The NIR phosphor‐converted light‐emitting diodes (pc‐LEDs) are fabricated by combining GaTaO4:Cr3+,Yb3+ with blue LED chips, and the application potential is fully demonstrated by non‐destructive food detection, night vision, and vein display. The results provide novel prospects for the design of NIR‐emitting materials with desirable luminescent properties.

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Structural Confinement toward Controlling Energy Transfer Path for Enhancing Near-Infrared Luminescence

Cited by 58 publications

References 43 publications

Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors

Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors

Rapid Nondestructive Detection Enabled by an Ultra‐Broadband NIR pc‐LED

Enhancement of Near‐Infrared Phosphor Luminescence Properties via Construction of Stable and Compact Energy Transfer Paths

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