CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Yang,Wei Lü,Jin Xiang Lim,Biao Wang
There is strong demand of exceptional efficiency for near-infrared (NIR) phosphors for next-generation integrated and intelligent multifunctional light-emitting diode (LED) devices. Designing NIR phosphors with excellent efficiency that simultaneously meet multiple application requirements is challenging. Hence, this work focuses on the NIR optical properties and the corresponding multifunctional applications for Cr 3+ activated LaMgAl 11 O 19 (LMAO) phosphors. The blue light excitable LMAO:Cr 3+ phosphors can produce intense NIR emission ranging from 630 to 1000 nm with an 95.8% internal quantum efficiency as well as excellent thermal stability (I 423 K /I 303 K = 75.9%). Additionally, benefiting from the strong correlation between fluorescence lifetime and ambient temperature, the LMAO:Cr 3+ phosphors were showed promising potential for application in temperature sensing. Notably, the NIR phosphor-converted LED devices based on LMAO:Cr 3+ phosphors and commercial blue LED chip were self-built, which exhibiting great potential for indoor plant cultivation, night vision, and nondestructive detection. This study describes the highly efficient LMAO:Cr 3+ phosphors preparation and the corresponding multifunctional applications in the fields of optical thermometry, indoor plant cultivation, night vision, and nondestructive detection, which is crucial for the next-generation integrated and intelligent multifunctional LED devices.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhongyu Tong,Jiamin Li,Yuqing Yan,Feifeng Huang,Guanyu Zhu,Huanping Wang,Hua Yu,Degang Deng
The development of tunable broadband near-infrared (NIR) fluorescent materials with excellent luminescent properties is still a challenge for the next generation of intelligent NIR light sources. Here, a series of Cr 3+ doped magnetoplum type NIR phosphors were prepared by the high-temperature solid-state method. Their luminescent properties and the methods to broaden the luminescence bandwidth were discussed in detail. In BaAl 12 O 19 : Cr 3+ phosphor, Cr 3+ -Cr 3+ ion pair was constructed based on heavily doped Cr 3+ ions, so as to broaden its spectral emission range. With the increase of Cr 3+ doping concentration, the full width at half maximum (FWHM) of BaAl 12 O 19 : Cr 3+ sample increased from 18.5 nm to 93.7 nm. Furthermore, the crystal field environment of Cr 3+ ions in BaAl 12 O 19 : Cr 3+ phosphors was changed by cationic substitution (Sr 2+ substituted Ba 2+ ion site). The FWHM of NIR emission increases from 49.37 nm to 123.78 nm, and the internal quantum efficiency (IQE) increases from 65.6 % to 76.2 %, with good thermal stability ( I 373 K / I 298 K = 77.3 %). An intense NIR emission of 31.3 mW at 100 mA is produced by the phosphor-converted light-emitting diode (pc-LED), exhibiting a photoelectric efficiency of 15.3 %.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 25
·44694-44701
·
IF 5.6
Honglei Yuan,Huizhong Ma,Gaoliang Wang,Huanxia Jia,Liwei Wang
This study systematically investigates the structural and luminescent characteristics of LaSc 3 (BO 3 ) 4 :x %Cr 3+ and La (1-y) Gd y Sc 3 (BO 3 ) 4 :1.0 %Cr 3+ phosphors. X-ray diffraction confirms the formation of a pure hunter-type structure for all samples, with Cr 3+ occupying Sc 3+ sites and Gd 3+ substituting La 3+ , inducing lattice contraction. Luminescent analysis reveals that LaSc 3 (BO 3 ) 4 :Cr 3+ exhibits an emission at 980 nm under 430 nm excitation, attributed to the 4 T 2 → 4 A 2 transition of Cr 3+ in a weak crystal field. The substitution of Gd 3+ enhances photoluminescence intensity by 2.15-fold, and blue-shifts emission to 938 nm because of increased crystal field splitting and structural rigidity. The broadened full width at half maximum is also formed due to the enhanced degree of disorder in GdSc 3 (BO 3 ) 4 . Thermal stability studies show that GdSc 3 (BO 3 ) 4 :Cr 3+ retains 49 % intensity at 540 K, outperforming LaSc 3 (BO 3 ) 4 :Cr 3+ (41 %), supported by higher activation energy (ΔE = 0.338 eV vs. 0.296 eV). The improved thermal resistance is linked to lattice rigidity and reduced electron-phonon coupling. NIR-pc-LEDs fabricated with GdSc 3 (BO 3 ) 4 :Cr 3+ demonstrate superior radiant flux (68.7 mW at 200 mA) compared to La-based devices. These results highlight the critical role of host lattice engineering in optimizing Cr 3+ luminescence for high-power NIR applications.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hongshi Zhang,Jiyou Zhong,Fu Du,Lei Chen,Xiaoli Zhang,Zhongfei Mu,Weiren Zhao
Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band NIR phosphors remains a significant challenge. In this work, a phosphate, KAlP2O7, with a wide band gap and suitable electronic environment for Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits a broad-band emission covering 650–1100 nm with a peak centered at 790 nm and a full width at half-maximum (fwhm) of 120 nm under 450 nm excitation. The internal quantum efficiency (IQE) was determined to be 78.9%, and the emission intensity at 423 K still maintains 77% of that at room temperature, implying the high efficiency and excellent thermal stability of this material. Finally, a NIR phosphor-converted light-emitting diode (pc-LED) device was fabricated by using the as-prepared material combined with a 450 nm blue LED chip, which presents a high NIR output power of 32.1 mW and excellent photoelectric conversion efficiency of 11.4% under a drive current of 100 mA. Thus, this work not only provides an inexpensive broad-band NIR material with high performance for applications in NIR pc-LEDs but also highlights some strategies to explore this class of materials.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yongqi Zhu,Yifan Yang,Shuang Wu,Yiwen Zhu,Xinyue Li,Qinan Mao,Yifan Chen,Rui Shi,Jiasong Zhong,Jing Wang
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are considered promising light sources for night vision, food analysis, biomedicine, and plant growth. Yet, the application potential of this technology is vulnerable to the function degradation of the phosphors used, such as thermal quenching, which needs to be addressed urgently. Herein, the NIR phosphors K2LiMF6:Cr3+ (M = Al, Ga, In) with a cubic double-perovskite structure synthesized by a green hydrofluoric acid-free hydrothermal method exhibit outstanding thermal stability. Under 450 nm excitation, the as-synthesized K2LiMF6:Cr3+ phosphors all exhibited broadband NIR emission covering 650–1000 nm peaking at 755–780 nm. The prepared K2LiAlF6:Cr3+ phosphor shows a unique zero-thermal quenching performance (I423 K/I298 K = 102%). The comprehensive effects of a wide band gap, large thermal energy barrier, weak electron–phonon coupling effect, and high structural rigidity are responsible for the suppression of thermal quenching in this material. The output power of the NIR pc-LED device reached 285 mW at 100 mA. This series of phosphors has promise in night vision and bioimaging applications.
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Yuan Tang,Pengbo Lyu,Desheng Yin,Zhaoqi Liu,Nian Pan,Kai Li,Ying Ye,Changfu Xu,Lizhong Sun
Ultra-broadband near-infrared (NIR) lighting sources covering NIR Ⅰ to III regions are pivotal components for NIR spectroscopy devices. However, achieving ultra-broadband and efficient emission covering the entire NIR Ⅰ to III regions remains a significant challenge. To address this, we selected Mg 7 Ga 2 GeO 12 as host material to realize ultra-broadband NIR emission. Density functional theory calculations on formation energies confirmed the feasibility of doping both Ni 2+ and Cr 3+ within Mg 7 Ga 2 GeO 12 . Band structure calculations reveal a significantly reduced band gap upon the doping of Ni 2+ . Following that, we synthesized Mg 7 Ga 2 GeO 12 :Ni 2+ through conventional solid-state-reaction method. This phosphor exhibits broadband NIR emission with a full-width-at-half-maximum of 377 nm in the range of NIR II ∼ III (1100–2100 nm). To further enhance the emission efficiency, we co-doped Mg 7 Ga 2 GeO 12 :Ni 2+ phosphor with Cr 3+ . This co-doping strategy not only dramatically enhances the Ni 2+ emission intensity, but also extends the lower limit of emission band to 600 nm. However, a spectral gap around 1150 nm remains between Cr 3+ and Ni 2+ emission centers. To bridge this spectral gap, we employed LiScSiO 4 :Cr 3+ phosphor alongside Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor to fabricate a phosphor converted LED (pc-LED) with ultra-broadband NIR emission covering entire NIR Ⅰ to III regions. By utilizing this pc-LED as the lighting source for NIR spectral detection, multiple organic functional group signals can be identified simultaneously in NIR II and III bands from 1000 to 2100 nm. The performance of such an NIR pc-LED not only confirms the application potential of Mg 7 Ga 2 GeO 12 :Ni 2+ ,Cr 3+ phosphor in non-destructive spectral analysis but also underscores the feasibility of combining two phosphors to achieve ultra-broadband NIR pc-LEDs, rendering them suitable to be lighting sources for portable spectrometers.
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·
IF 6
Xue Meng,Zhijun Wang,Xiaoxue Huo,Mingxin Zhou,Yu Wang,Panlai Li
Near-infrared (NIR) light attracts attention because of its promising applications in night vision, anti-counterfeiting, biosensors, and measuring food composition and freshness. However, new NIR light sources with excellent thermal stability, higher efficiency, and superior photoelectric conversion efficiency are still a significant challenge. In this study, CaZrTaGaO7:0.01Cr3+, which can convert visible light into NIR light, was synthesized using a high-temperature solid-state method, and the crystal structure, morphology, site preference, and luminescence properties were investigated. Under 460 nm blue light excitation, the phosphor produces a broadband NIR emission in the 600–1100 nm region (λmax = 829 nm), with a full width at half maximum of 178 nm, an internal quantum efficiency of 90.7%, and an excellent thermal stability of 84.8% at 423 K. A NIR light emitting diode (LED) was prepared using a 460 nm LED chip and CaZrTaGaO7:0.01Cr3+, and the new compound can produce strong NIR emission (273 mW at 100 mA) with a photoelectric conversion efficiency of 11.8%. Photographed phosphor-converted LEDs (pc-LEDs) with a regular camera and captured pc-LEDs in operation in the dark. The results indicate that this material may provide a new option for high power NIR night vision and other applications.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 13
·4825-4834
·
IF 5.7
Huijie Wu,Sisi Liang,Weixiong You,Le Liu,Yongwei Guo,Shujian Wang,Liping Song,Zihao Wang,Haomiao Zhu
Near-infrared (NIR) phosphors with emission peak wavelength longer than 800 nm have attracted significant attention due to their wide applications. However, a key challenge lies in developing high photoluminescence (PL) thermal stability phosphors. Herein, we synthesized a NIR phosphor Na3Al2(PO4)2F3:Cr3+ (NAPOF:Cr3+) through the solid-state reaction method. The NAPOF:Cr3+ phosphor exhibits an intense broadband emission peak at 810 nm and covers a wide spectral range from 650 to 1100 nm. Notably, this phosphor demonstrates zero PL thermal quenching even at 398 K. This outstanding thermal stability can be primarily ascribed to the inherent structural rigidity and wide bandgap of the NAPOF crystal together with the medium electron–photon coupling effect. The fabricated broadband NIR light-emitting diodes (LEDs) using the NAPOF:Cr3+ phosphor exhibits a highest NIR light output power of 28.1 mW under a drive current of 150 mA, and a corresponding electro-optical conversion efficiency of 8.6%. Our findings highlight the tremendous potential of the NAPOF:Cr3+ phosphor for broad-spectrum NIR-LED applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Jianlin Zhang,Weiren Zhao,Xiaoli Zhang,Yang Li,Wei Zhang,HongLi Wen,Jiyou Zhong
Broadband near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have extensive applications basing on spectroscopy technology, which promote the exploration of broadband NIR phosphors. However, there are still lack of efficient ultra-broadband NIR phosphors with peak emission wavelength over 850 nm. In this work, a series of double-perovskite-type Ca 2 InTaO 6 :Cr 3+ NIR phosphors were successfully prepared through a conventional high-temperature solid-state reaction process. Optimizing the Cr 3+ doping concentration, the obtained phosphor exhibits an ultra-broadband emission covering 700–1300 nm with peak wavelength located at 880 nm. The full width at half maximum (FWHM) of this phosphor reaches 200 nm ascribing to the two crystallographic sites in this compound that are available for Cr 3+ substitution. Upon 480 nm excitation, the photoluminescence quantum yield (PLQY) and absorption efficiency are determined to be 33.6% and 30.6%, respectively, indicating an excellent efficiency within this emission range among ultra-broadband NIR phosphors. Thus, this work provides an alternative Cr 3+ -activated ultra-broadband and long-wavelength NIR phosphor Ca 2 InTaO 6 :Cr 3+ for the upcoming smart spectroscopy applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Daochuan Duan,Shijie Yu,Yubo Wu,Yan Dong,Qiyue Shao,Jianqing Jiang
Far-red-emitting (700−740 nm) phosphors are essential for the fabrication of plant lighting phosphor-converted light-emitting diodes (pc-LEDs). However, the development of highly efficient, thermally stable, and spectrally matched far-red phosphors still remains a challenge. Herein, far-red GdAlO 3 :Cr 3+ (GAO:Cr 3+ ) phosphors were synthesized via solid-state reaction and investigated for plant lighting pc-LED applications. A low-temperature flux-assisted synthesis strategy was adopted to improve the crystalline quality, suppress the defect formation, and maintain the valence state of Cr 3+ in the phosphors, finally leading to significant luminescent enhancement (∼10 times). The GAO:Cr 3+ phosphors show the 2 E sharp-line emissions around 730 nm, which is highly matched with the far-red absorption band of plants. The optimized GAO:0.01Cr 3+ phosphor exhibits a high internal quantum efficiency of 98.3% and zero thermal quenching even up to 250°C. The fabricated pc-LED can generate an overall output power of 78.1 mW at 100 mA drive current, with a high energy conversion efficiency of 25.3%. The findings demonstrate the great potential of GAO:Cr 3+ as far-red-emitting phosphor materials for plant growth pc-LED applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Qing Song,Qiu-Yue Kang,Sa-Ying Li,Qiu-Yan Yu,Zhi-Hong Liu
Three isotypic polyborate cluster compounds for Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O, Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O and Na 5 [GaB 24 O 34 (OH) 12 ]·3H 2 O have been synthesized and characterized by EDS, XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O (s) and Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O (s) in 1 mol · dm −3 HCl (aq) were measured to be (58.27 ± 0.15) kJ · mol −1 and (130.99 ± 0.33) kJ · mol −1 , respectively. The molar enthalpies of solution of AlCl 3 ·6H 2 O (s) and CrCl 3 ·6H 2 O (s) in (HCl + H 3 BO 3 + NaCl) (aq) were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the standard molar enthalpies of formation for AlCl 3 ·6H 2 O (s)/CrCl 3 ·6H 2 O (s), NaCl(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of −(21316.0 ± 19.3) kJ · mol −1 for Na 5 [CrB 24 O 34 (OH) 12 ]·5H 2 O (s) and −(21669.7 ± 19.3) kJ · mol −1 for Na 5 [AlB 24 O 34 (OH) 12 ]·5.5H 2 O (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. The molar enthalpy of formation of Na 5 [GaB 24 O 34 (OH) 12 )]·3H 2 O was estimated as −20662.9 kJ · mol −1 by using a group contribution method on the basis of these measured results.
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanfei Zou,Chen Hu,Shoukun Lv,Yimeng Shao,Bing Teng,Fei You,Hui Xu,Degao Zhong
As a key material for phosphor-converted light-emitting diodes (pc-LEDs) applications, broadband near-infrared (NIR) phosphors currently face poor thermal stability issues. In this work, we synthesized a broadband near-infrared phosphor YGa3(BO3)4: Cr3+ (YGBO: Cr3+) with a high thermal stability. The YGBO: Cr3+ sample exhibits a broadband near-infrared emission centered at 770 nm with a full width at half-maximum (fwhm) of 2130 cm–1 under blue light excitation. Benefiting from the borate host crystal’s strong structural rigidity, wide optical band gap, and weak electron–phonon coupling strength, YGBO: Cr3+ demonstrates strong luminescence thermal stability, and the corresponding luminescence intensity can maintain 80% at 150 °C compared to room temperature. Furthermore, we fabricated a pc-LED device using a blue light chip and YGBO: Cr3+ phosphor, and confirmed its application potential as a near-infrared light source in the spectral analysis of fruit freshness.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）