Highly efficient and thermally stable broadband near-infrared emitting fluoride Cs2KGaF6:Cr3+ for multiple LED applications

Wu, Zixuan; Han, Xinxin; Wang, Juan; Zhou, Yayun; Xing, Ke; Cao, Sheng; Zhao, Jialong; Zou, B. S.; Zeng, Ruosheng

doi:10.1039/d2tc02020c

Cited by 18 publications

(20 citation statements)

References 45 publications

(57 reference statements)

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“…Further increase in the dopant content ineluctably results in decreased PL intensities due to the concentration quenching effect. 37 The energy transfer mechanism is determined by estimating the R c value using the following equation: 37 where R c means the critical distance between adjacent Cr 3+ ions, V and N stand for the volume and the available substitution site number in the RNYF:Cr unit cell, respectively, and x is the dopant concentration. For the RNYF:0.10Cr phosphor, the V and N values are 697.51 Å 3 and 4 and x equals 0.10.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the calculated critical distance (14.94 Å) is nearly three times larger than the demarcation value (5 Å), implying that the energy transfer mode of the exchange interaction is diminished in this work, and the multipolar interaction dominates the concentration quenching effect of the RNYF:0.10Cr phosphor. The exact interaction type can be estimated by the θ value using the following equation: 37 …”

Section: Resultsmentioning

confidence: 99%

“…As demonstrated above, the broadband NIR phosphor has great potential in multifunctional application fields owing to its strong penetration and non-invasive characteristics. 9,37 Therefore, its application in non-destructive detection is worth further investigation based on the above results to verify the use of the RNYF:Cr phosphor in NIR LED devices. Fig.…”

Section: Papermentioning

confidence: 89%

Section: Dqmentioning

confidence: 99%

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Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Qing¹,

Zhang

Yang

et al. 2022

Dalton Trans.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Papermentioning

confidence: 89%

Section: Dqmentioning

confidence: 99%

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Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Qing¹,

Zhang

Yang

et al. 2022

Dalton Trans.

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“…The Cs 2 KIn 0.8 Al 0.1 F 6 :0.1Cr 3+ starts to decompose at ∼700 °C, further suggesting its good structural thermal stability. It is worth mentioning that if both thermal stability and IQE are considered (as shown in Figure f), the as-prepared Cs 2 KIn 0.8 Al 0.1 F 6 :0.1Cr 3+ phosphor possesses a superior overall performance compared with the ones reported, exhibiting a promising application prospect. − …”

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confidence: 99%

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Wang

Han

Zhou

et al. 2023

J. Phys. Chem. Lett.

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The rising demand for portable near-infrared (NIR) light sources has accelerated the exploration of NIR luminescent materials with high efficiency and excellent thermal stability. Inspired by the structural-modulated ion substitution strategy, herein, a high-performance Cs2KIn0.8Al0.1F6:0.1Cr3+ phosphor with a peak at 794 nm and full width at half-maximum (fwhm) of 117 nm was successfully synthesized by introducing Al3+ ions. The high performance is reflected in its high internal quantum efficiency (IQE) of 88.06% and good thermal quenching resistance (I 423K = 71.64%). Compared with the initial Cs2KInF6:0.1Cr3+, the IQE and thermal stability are improved by 16.67% and 72.54%, which stem from the enhanced crystallinity and the strengthened structural rigidity. Finally, a phosphor-converted light-emitting diode (pc-LED) with a superior NIR photoelectric efficiency (21.04%@320 mA) was fabricated. Meanwhile, the pupil tracking, anticounterfeiting, intelligent identification, and bioimaging were successfully demonstrated. This work provides new perspectives for synthesizing efficient NIR fluoride phosphors and designing diverse applications.

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An Efficient Perovskite‐Like Phosphor with Peak Emission Wavelength at 850 nm for High‐Performance NIR LEDs

Tang

Xiao

et al. 2022

Advanced Optical Materials

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700-1100 nm range to obtain more effective information in practical application such as food analysis, medical diagnostics, and agricultural science. [5][6][7][8] On the other hand, integrating the NIR spectroscopy into mobile phones or wearable devices are emerging demand that call for NIR light source with small size. [9,10] The traditional tungsten-halogen lamps or supercontinuum lasers cannot meet these new applications because of their large size, short lifetime, and poor efficiency. [11,12] NIR light emitting diodes (LEDs) show the advantages of small size, but their emission bandwidth is less than 50 nm, which is too narrow. [13,14] In this context, phosphor-converted LEDs (pc-LEDs) with broad NIR emission were recently proposed, where one or more kinds of NIR phosphors were coated on a blue LED chip. The broad and tunable emission band as well as the small size of such NIR pc-LEDs make them an excellent alternative light source for miniature NIR spectroscopy applications.The NIR phosphor acts as a key role to convert blue light from LED chip to broadband NIR light. [15] Thus, many efforts have been made to explore NIR phosphors with broad emission band and high efficiency, such as K 3 LuSi 2 O 7 :Eu 2+ (740 nm), [16] CaS:Eu 2+ ,Tb 3+ (810 nm) [17] and Lu 2 BaAl 4 SiO 12 :Ce 3+ ,Mn 2+ (770 nm). [18] The main drawbacks of that Eu 2+ /Ce 3+ activated phosphor are their relatively short emission wavelength (<850 nm), low internal quantum efficiency (IQE), and poor thermal stability. Thus, Cr 3+ -activated NIR phosphors draw more attention for their broad emission bandwidth and high efficiency. [19,20] For example, Song et al. reported K 2 NaScF 6 :Cr 3+ NIR phosphor with an emission band peaking at 765 nm and IQE of 74%. [21] Zheng and co-workers designed Y 2 CaAl 4 SiO 12 :Cr 3+ translucent ceramics by cation co-substitution of Ca 2+ -Si 4+ for Y 3+ -Al 3+ and achieved high IQE (90.1%) and external QE (EQE) (59.5%). [22] Highly efficient NIR emissions have also been reported in other phosphors such as Ca 2 LuHf 2 Al 3 O 12 :Cr 3+ (775 nm), [4] La 2 MgZrO 6 :Cr 3+ (825 nm), [10] Ga 2 O 3 :Cr 3+ (740 nm), [23] GdAl 3 (BO 3 ) 4 :Cr 3+ (733 nm), [24] LaMgGa 11 O 19 :Cr 3+ (770 nm) [25] and so on. Though the above NIR phosphors have high IQE and excellent thermal stability, they also suffer from deficient emission in 850-1100 nm, which limits their practical applications. Some NIR phosphors with longer wavelength emission (>850 nm), such as La 3 Ga 5 GeO 14 :Cr 3+ (920 nm), [26] ZnTa 2 O 6 :Cr 3+ (935 nm), [27] and LiIn 2 SbO 6 :Cr 3+ (965 nm), [28] were reported, but their IQEs are Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are an emerging light source demanded for the miniaturization of NIR spectroscopy. However, the photoelectric efficiency and spectral properties of NIR pc-LEDs are still very limited due to a lack of efficient broadband NIR phosphors with peak emission wavelength >850 nm. Here, a novel Cr 3+ -activated perovskite-like Mg 4 Ta 2 O 9 phosphor is reported, which exhib...

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Highly efficient and thermally stable broadband near-infrared emitting fluoride Cs₂KGaF₆:Cr³⁺ for multiple LED applications

Abstract: Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) is a promising next-generation micro light source for smart and broadband NIR spectroscopy. However, the improvement of photoluminescence quantum yield and thermal quenching stability...

Cited by 18 publications

References 45 publications

Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

An Efficient Perovskite‐Like Phosphor with Peak Emission Wavelength at 850 nm for High‐Performance NIR LEDs

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Highly efficient and thermally stable broadband near-infrared emitting fluoride Cs2KGaF6:Cr3+ for multiple LED applications

Abstract: Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) is a promising next-generation micro light source for smart and broadband NIR spectroscopy. However, the improvement of photoluminescence quantum yield and thermal quenching stability...

Cited by 18 publications

References 45 publications

Luminescence properties of Cr3+-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Luminescence properties of Cr3+-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs2KIn1–yAlyF6:Cr3+ Solid Solutions

An Efficient Perovskite‐Like Phosphor with Peak Emission Wavelength at 850 nm for High‐Performance NIR LEDs

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Highly efficient and thermally stable broadband near-infrared emitting fluoride Cs₂KGaF₆:Cr³⁺ for multiple LED applications

Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Luminescence properties of Cr³⁺-doped near-infrared emissive fluoroyttrates for light-emitting diodes

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions