Multi-site occupation of Cr3+ toward developing broadband near-infrared phosphors

Su, Yue; Yuan, Lifang; Liu, Hai; Xiong, Guangting; Wu, Haoyi; Hu, Yihua; Cheng, Xiang; Jin, Yahong

doi:10.1016/j.ceramint.2021.05.073

Cited by 33 publications

(11 citation statements)

References 36 publications

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“…The excitation band at around 450–550 nm comes from the transition between 4 A 2 – 4 T 1 ( 4 F) of Cr 3+ , and the excitation at 670 nm is attributed to the transition between 4 A 2 – 4 T 2 of Cr 3+ , respectively. 29,30…”

Section: Resultsmentioning

confidence: 99%

“…The excitation band at around 450-550 nm comes from the transition between 4 A 2 -4 T 1 ( 4 F) of Cr 3+ , and the excitation at 670 nm is attributed to the transition between 4 A 2 -4 T 2 of Cr 3+ , respectively. 29,30 Furthermore, the relationship between the doping concentration and luminescence properties of the LiInO 2 :xCr 3+ phosphor was illustrated in Fig. S1 (ESI †).…”

Section: Structural and Spectral Properties Of The Liino 2 :Cr 3+ Pre...mentioning

confidence: 99%

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A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

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Section: Resultsmentioning

confidence: 99%

Section: Structural and Spectral Properties Of The Liino 2 :Cr 3+ Pre...mentioning

confidence: 99%

A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

et al. 2022

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“…Broadband near-infrared (NIR) light sources are rapidly becoming the light sources of choice for food quality testing and analysis, [1] night vision, [2] biological tissue imaging, [3] and regulation of plant growth due to their advantages such as fast and convenient non-destructive. [4] In particular, the light source in the 700-1100 nm spectral range, which allows the nondestructiveness detection of organic components by using different responses of CH, OH, and NH groups.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

Wang

Wei

et al. 2022

Advanced Optical Materials

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light in this range is known as the first biological window, and the NIR radiation can effectively penetrate biological tissues, which means that a non-destructive and non-invasive diagnosis of the human physiological state can be performed by a perceptible penetration depth in biological tissues. [6] For plant cultivation, red/ photosensitive pigments (PR) and far-red/ photo sensitive pigments (PFR), two pigments indispensable for plant growth, have a specific absorption in the NIR region, and PFR has a strong absorption peak at 730 nm. [7] Various NIR-emitting materials have been developed for halogen lamps, lightemitting diodes (LEDs), organic LEDs (OLED), and phosphor-converted LEDs (pc-LEDs). Among them, halogen lamps have continuous ultra-broadband spectral properties from visible to NIR, but their low luminous efficiency, high operating temperature, and long response time limit their applications. [8] NIR LEDs overcome most of the drawbacks of halogen lamps, but the narrow fullwidth at half maximum (FWHM) and the LED arrangement luminous unevenness also severely limit their utilization at scale. [9] OLEDs are disappointing in terms of efficiency or temperature resistance, even though they have good applicability. [10] The most suitable solution may be the development of NIR pc-LEDs combining InGaN blue LED chips with broadband NIR phosphors. It satisfies both the ultra-broadband spectral emission and the requirements of compactness, efficiency, portability, and low cost. [11] For this purpose, broadband NIR phosphors that are well matched to the blue LED chips need to be developed.Many NIR broadband phosphors based on inorganic matrixdoped activators have been reported so far, [12] however, most of them have disadvantages such as unsuitable NIR emission wavelength, unstable emission intensity at high temperature, and low luminescence efficiency, which greatly limit their applications in various fields. Cr 3+ ions exhibit broadband absorption in the ultraviolet-visible spectral range, which stems from its unique 3d 3 electronic structure. [13] In addition, Cr 3+ ions can display tunable narrowband or broadband spectrum from 600-1600 nm, depending on whether they are in a strong or weak Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LED) are ideal light sources to meet the next generation of NIR spectroscopy. However, NIR phosphors have numerous problems such as low quantum yields (QY) and low thermal stability. In this work, a series of Gd 3 Y x In x Ga 5-2x O 12 :Cr 3+ NIR broadband phosphors with high internal quantum yields (IQYs) and high thermal stability are discovered by uniquely replacing GaO 6 in Gd 3 Ga 5 O 12 with Y 3+ and In 3+ in a co-doped manner through cation modulation. Under 449 nm excitation, Gd 3 Y 0.5 In 0.5 Ga 4 O 12 (GYIG):yCr 3+ depicts emission from 650 to 1050 nm with a full-width at half maximum (FWHM) of 134 nm. The emission intensity reaches its optimum value at y = 6%, while the IQY reaches an impressive 81.8% and, at 375 K, the emission intensity r...

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“…The linear relationship for ln(I 0 /I T − 1) and 1/KT (as exhibited in Fig. 4(d)) is obtained and the thermal activation energy (ΔE) for MAS:0.02Cr 3+ is established to be 0.275 eV, which is above that for Mg 7 Ga 2 GeO 12 :Cr 3+ (ΔE = 0.236 eV), 49 Ca 2 LuHf 2 Al 3 O 12 :Cr 3+ (ΔE = 0.238 eV), 50 and LaMgGa 11 O 19 :Cr 3+ (ΔE = 0.24 eV). 51 In general, thermal activation energy is positively correlated with thermal stability.…”

Section: Paper Dalton Transactionsmentioning

confidence: 79%

A new broadband near-infrared emitting Mg₂Al₄Si₅O₁₈:Cr³⁺ phosphor for night-vision imaging

et al. 2022

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Multi-site occupation of Cr3+ toward developing broadband near-infrared phosphors

Cited by 33 publications

References 36 publications

A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

A new broadband near-infrared emitting Mg₂Al₄Si₅O₁₈:Cr³⁺ phosphor for night-vision imaging

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Multi-site occupation of Cr3+ toward developing broadband near-infrared phosphors

Cited by 33 publications

References 36 publications

A simple and generic post-treatment strategy for highly efficient Cr3+-activated broadband NIR emitting phosphors for high-power NIR light sources

A simple and generic post-treatment strategy for highly efficient Cr3+-activated broadband NIR emitting phosphors for high-power NIR light sources

Highly Efficient and Stable Near‐Infrared Broadband Garnet Phosphor for Multifunctional Phosphor‐Converted Light‐Emitting Diodes

A new broadband near-infrared emitting Mg2Al4Si5O18:Cr3+ phosphor for night-vision imaging

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A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

A simple and generic post-treatment strategy for highly efficient Cr³⁺-activated broadband NIR emitting phosphors for high-power NIR light sources

A new broadband near-infrared emitting Mg₂Al₄Si₅O₁₈:Cr³⁺ phosphor for night-vision imaging