ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yu Yan,Mengmeng Shang,Shuai Huang,Yining Wang,Yixin Sun,Peipei Dang,Jun Lin
Near-infrared (NIR) phosphors are fascinating photoluminescence materials with applications in phosphor-converted light-emitting diodes (pc-LEDs) for night vision lighting, which are still restricted by low efficiency and thermal stability in the current research stage. In this work, AScSi2O6 (A = Na/Li) are chosen as hosts due to a larger band gap and a single octahedral site for Cr3+ doping. The NIR-emitting Cr3+-activated AScSi2O6:Cr3+ phosphors were successfully prepared by a common high-temperature solid-state method. X-ray diffraction and Rietveld refinement confirm that the Cr3+ prefers to enter the Sc3+-octahedral lattice site in the AScSi2O6 structure. Under blue light excitation, AScSi2O6:Cr3+ phosphors exhibit broadband NIR emission from 700 to 1100 nm with a full width at half-maximum of ∼150 nm owing to the 4T2 → 4A2 electron transition of Cr3+. The photoluminescence properties were enhanced by adjusting the fluxes and sintering conditions, and highly efficient LiScSi2O6:Cr3+ NIR phosphors with external quantum efficiencies of 33.4% were obtained. Moreover, the optimized LiScSi2O6:Cr3+ exhibits excellent thermal stability (75% at 150 °C) with an activation energy of 0.33 eV. Importantly, the fabricated NIR pc-LED with the highly efficient LiScSi2O6:Cr3+ phosphor demonstrates brighter NIR light and a higher luminous efficacy than the NaScSi2O6:Cr3+ phosphor in night vision.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2025
·
IF 3.8
Bo Gao,Xiao Zang,Xiuhui Yin,Baolei Qi,Jiahao Li,Zewen Dong,Xufeng Zhou,Wei Li,Yangbo Wang,Huaiyong Li
Broadband near-infrared (NIR) phosphors emitting in the 700–1000 nm range find extensive applications in night vision, medical image, and food analysis. High luminescence thermal stability of their spectra is crucial for maintaining consistent and reliable output under various thermal conditions. Microcrystalline powders of Sr2Sc2B4O11:Cr3+ are synthesized, and their photoluminescence (PL) properties are studied as functions of Cr3+ concentration, temperature, and excitation power. The energy band structure and phonon density of states of the Sr2Sc2B4O11 lattice are studied theoretically. It is revealed that Sr2Sc2B4O11 is an indirect bandgap material with a bandgap of 3.16 eV. Sr2Sc2B4O11:Cr3+ shows broadband NIR emission centered at 825 nm upon 455 nm excitation with lifetimes on the order of 100 μs from 80 to 600 K. The PL shows good luminescence thermal stability with a quenching temperature of 380 K. Notably, 57% of the room-temperature PL intensity is retained at 423 K. The high luminescence thermal stability of the PL may be attributed to the constraint on the deformation of ScO6 polyhedra through the formation of dimers. A luminescence thermometer based on the lifetime of Sr2Sc2B4O11:Cr3+ is proposed. It is determined that the relative sensitivity of the thermometer increases gradually from 80 to 600 K and exceeds 0.5% K–1 starting from 300 K.
研究领域:
材料科学
·
光学
·
无机化学
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 8
·1692-1700
·
IF 7.779
Decai Huang,Xianguo He,Jingrong Zhang,Jie Hu,Sisi Liang,Dejian Chen,Kunyuan Xu,Haomiao Zhu
In recent years, near-infrared phosphor-converted light emitting diodes (NIR pc-LEDs) have been emerging as a promising compact and efficient NIR light source for a variety of applications such as sensing, bioimaging and food analysis. However, the development of broadband NIR phosphors with both high emission efficiency and excellent photoluminescence (PL) thermal stability is still facing a great challenge. Herein, a blue light excitable AlP3O9:Cr3+ phosphor with a broadband NIR emission covering 650–1000 nm is presented. In particular, in situ variable-temperature XRD measurements demonstrate that the AlP3O9:Cr3+ phosphor shows a near zero thermal expansion in the temperature range of 300–423 K, which is beneficial for achieving good PL thermal stability. The experiment shows that ∼91% of the PL intensity is retained at 423 K compared to that at room temperature, verifying our hypothesis. An efficient NIR pc-LED is fabricated by using the AlP3O9:Cr3+ phosphor and commercial blue diode chips, generating a NIR radiant flux of 29.5 mW at 60 mA drive current. Finally, the NIR pc-LED was successfully used as the light source for identifying spoiled eggs based on the NIR spectroscopic technique. This work provides a strategy to achieve high performance NIR phosphor systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibang Liu,Gaoliang Wang,Liuyang Xu,Huanxia Jia,Xianke Sun,Honglei Yuan
NIR phosphor-converted light emitting diodes possess extensive application in a variety of occasions. And the exploration of NIR phosphors having outstanding quantum yield and thermostability is still a challenge. In this work, the layered structure and broadband GaTa 0.5 Nb 0.5 O 4 :Cr 3+ phosphors owning excellent performance were synthesized. The GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor provides a quantum yield of 92.2%, as well as an activation energy of 0.329. The NIR pc-LED formed via the combination of GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor and blue LED chip owns an output power of 4.56 mW and a photoelectric conversion efficiency of 9.37% when driven at 20 mA, and the output power increases to be 44.6 mW and the photoelectric conversion efficiency changes to be 7.19% when driven at 250 mA. The results of this work demonstrated that the Cr 3+ activated GaTa 0.5 Nb 0.5 O 4 phosphors may be a prospective candidate for NIR phosphor-converted light emitting diodes.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2024
·
IF 13.9
Kaina Wang,Jipeng Fu,Hongliang Dong,Bingyu Huang,Jinru Liu,Long Tian,Jing Feng,Chunzhen Yang,Chenjie Lou,Ligang Xu,Tianyi Sun,Huajie Luo,Shiqing Xu,Guowei Yin,Hongjie Zhang,Mingxue Tang
Near-infrared (NIR) phosphors have been widely used in biomedical applications based on their deep tissue penetration. However, the lack of blue-pumped NIR phosphors with emission ranges beyond 1000 nm has greatly limited the development of NIR phosphor-converted light-emitting diodes (pc-LEDs). Herein, a facile way to boost the luminescence efficiency and thermal stability by introducing the promoters of Ce 3+ and Na + into Nd 3+ -doped SrS NIR phosphor is demonstrated, thus achieving light emitting at 850–1500 nm with a peak wavelength of ≈1070 nm. Through sensitization by the allowed 4 f → 5 d transition of Ce 3+ , the SrS: Nd 3+ phosphors are excitable by using a commercial blue LED, attributing to the effective energy transfer between Nd 3+ and Ce 3+ . Besides, the structural analysis and density functional theory calculations reveal the lattice distortion mechanism and geometry of doping ions contributed to the weakened thermal quenching effect and the increasing of internal quantum efficiency. The optimized NIR phosphor luminescence intensity remains at 91.8% of the initial intensity at 393 K, and the internal quantum efficiency increases to 42.8% from 31.7% of the sample without Na + doping. The present exploration of Nd 3+ -doped NIR phosphors will provide a reference for designing NIR pc-LEDs with enhanced properties.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 9
·4577-4584
·
IF 3.784
Tianyao Liu,Hao Cai,Ning Mao,Zhen Song,Quanlin Liu
Broadband near-infrared phosphors are essential to realize nondestructive analysis in food industry and biomedical areas. Efficient long-wavelength (>830 nm) phosphors are strongly desired for practical applications. Herein, we demonstrate an efficient broadband NIR phosphor LiInGe 2 O 6 :Cr 3+ , which exhibits a broad NIR emission peaking at ~880 nm with a full width at half maximum of 172 nm upon 460 nm excitation. The internal/external quantum efficiencies of LiInGe 2 O 6 :Cr 3+ are measured to be 81.2% and 39.8%, respectively. The absorption of the phosphor matches well with commercial blue LEDs. Using the fabricated phosphor converted LED illuminating human palm, distribution of blood vessels can be clearly recognized under a NIR camera. These results indicate that LiInGe 2 O 6 :Cr 3+ is a promising candidate to be used in future non-destructive biological applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Hui Zhu,Yuanyuan Zhao,Siqi He,Zhe Yang,Sha Ouyang,Yuexiang Xi,Chunli Xin,Maxim S. Molokeev,Ming Cheng,Xiaoyan Chen,Gemechu Deressa Edossa,Mao Xia,Zhi Zhou
Cr 3+ -activated near-infrared (NIR) phosphors have great potential in plant lighting, noninvasive detection, iris recognition, etc. Herein, an aluminoborate host material with a wide band gap (E g = 4.60 eV) and high Debye temperature is selected to prepare a NIR phosphor Al 5 BO 9 : Cr 3+ (ABO: Cr 3+ ). The phosphor exhibits typical intermediate crystal field luminescence and has a high degree of matching with plant phytochrome. The photoluminescence intensity at 150 °C retains 91.1 % at room temperature. In addition, the spectral redshift (730 nm–770 nm) is achieved through the crystal field modulation, which is beneficial to broaden its application scenarios, such as plant antiviral immunity, night vision and noninvasive detection. Finally, the rice cultivation experiment confirms that the supplement of NIR light promotes growth, stress resistance and leaf angle of rice seedlings.
研究领域:
材料科学
·
植物学
·
农业科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yun Wang,Zhiyuan Pan,Sihan Feng,Lijie Gao,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Near-infrared (NIR)-emitting phosphors with high quantum efficiency and thermal stability are crucial to NIR pc-LEDs. Garnet-structured (GdLuCa)(Al4–zSiCrz)O12 (z = 0.01–0.2) and (Gd2–xLuCax)(Al4.95–xSixCr0.05)O12 (x = 0.2–1.0) new phosphors with promising NIR luminescence under blue light excitation were designed and fabricated by a solid-state reaction in this work. It was analyzed that the Ca2+, Cr3+, and Si4+ ions would replace Gd3+ in [GdO8], Al1 in [Al1O6], and Al2 in [Al2O4], respectively, and the optimal Cr3+ content is z = 0.05, above which concentration quenching would occur via an electric dipole–dipole interaction. Increasing Ca2+/Si4+ substitution up to x = 1.0 led to luminescence enhancement by a factor of up to 1.85 and internal/external quantum efficiency (%) increment from ∼25.9/10.7 to 63.4/27.5, and all of the phosphors showed excellent thermal stability (I423 K/I298 K ≥ 87.6%). The luminescence properties of Cr3+ were discussed in detail through systematic investigation of the effects of Cr3+ and Ca2+/Si4+ contents on the crystal structure, local coordination, and crystal field. With the NIR pc-LED device integrated from the optimal phosphor (x = 1.0) and a blue LED chip, electroluminescence manifested potential applications in night vision and medical diagnosis.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
PubMed
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.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 2
·966-976
·
IF 3.784
Hongyu Lv,Zhichao Liu,Chao Wang,Yiyu Cai,Hao Zhang,Ting Wang,Xiuxia Yang,Xue Yu,Jianbei Qiu,Xuhui Xu
The exploration of the high thermal stability near-infrared (NIR) phosphors is significantly crucial for the development of plant lighting. However, NIR phosphors suffer from the poor chemical and thermal stability, which severely limits their long-term operation. Here, the successful improvement of luminous intensity (149.5%) and thermal stability at 423 K of Zn 3 Ga 2 GeO 8 (ZGGO): Cr 3+ phosphors is achieved for the introduction of Al 3+ ions into the host. The release of carriers in deep traps inhibits the emission loss for the thermal disturbance. Furthermore, an NIR light emitting diodes (LEDs) lamp is explored by combining the optimized Zn 3 Ga 1.1675 Al 0.8 GeO 8 : 0.0325Cr 3+ phosphors with a commercial 460 nm blue chip, and the emission band can match well with the absorption bands of photosynthetic pigments and the phytochrome (P R and P FR ) of plants. The explored LEDs lamp further determines the growth and the pheromone content of the involved plants for the participation of the NIR emission originated from Cr 3+ ions. Our work provides a promising NIR lamp as plant light with improved thermal stability for long-term operation.
研究领域:
植物学
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 21
·2400574
·
IF 8
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Wendong Nie,Zihao Wang,Maochun Hong
Transition metal ions, such as Cr 3+ , Fe 3+ , and Ni 2+ , are widely recognized activators for efficient broadband near-infrared (NIR) phosphors. However, the potential of Mn 2+ ions as NIR-emitting activators is relatively overlooked due to their typically narrowband emission in the visible spectral region and relatively weak absorption. Herein, a heavy Mn 2+ -doped Zn 1-x Al 2 O 4 : xMn 2+ (ZAO: xMn 2+ ) phosphor is presented that exhibits a single NIR emission band peaked at 830 nm with a bandwidth of 135 nm under excitation at 450 nm. Through comprehensive structural and spectral analysis, this NIR band is attributed to the emission originating from Mn 2+ ions within the MnO 6 octahedra. Importantly, the formation of Mn 2+ –Mn 2+ dimers breaks the spin-forbidden rule and significantly enhances the transition probability, as supported by the excited state dynamic analysis. Consequently, the optimal ZAO: 0.70Mn 2+ sample shows high internal/external photoluminescence quantum yields of 85.8%/36.9%, along with good thermal stability demonstrated by the emission intensity at 423 K retains 60% of that at 298 K. Finally, a prototype NIR pc-LED device is fabricated by combining ZAO: 0.70Mn 2+ phosphor with a 450 nm blue diode chip, generating an NIR output power of 28.84 mW at 100 mA. This study provides novel insights into high-performance Mn 2+ -activated NIR phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 13
·期 1
·2401957
·
IF 8
Xin Xie,Wanyin Ge,Qian Zhang,Ye Tian,Zili Luo,Shifan Shang,Jianke Liu,Wenbin Cao
Cr 3+ -doped near-infrared (NIR) phosphors have attracted significant attention in recent years. Despite this, achieving high-performance NIR phosphors with broadband emission and excellent thermal stability remains a considerable challenge. This study presents Lu 3 Ga 5 O 12 :Cr 3+ , which demonstrates a tunable emission peak ranging from 705 to 759 nm and an increased full-width at half-peak maximum (FWHM) from 46 to 139 nm by substituting the [Mg 2+ -Ge 4+ ] chemical unit for the [Ga 3+ -Ga 3+ ] unit. Additionally, in Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , an energy transfer channel (Cr 3+ -Yb 3+ ) is constructed. Under blue light excitation, the characteristic emission peaks of Cr 3+ (600–900 nm) and Yb 3+ (900–1100 nm) are observed simultaneously. However, the emission band between 850 and 900 nm is relatively weak, resulting in a discontinuous emission spectrum. To address this, Lu 3 MgGa 3 GeO 12 :Cr 3+ , Yb 3+ , Nd 3+ phosphors are proposed, which exhibit a continuous broadband NIR emission with a FWHM of 253 nm and internal quantum efficiency of 47.3%. The luminescence intensity retains 81% of its room temperature value even at 423 K. Combining this new phosphor with a blue LED chip results in a portable NIR light source with potential applications in non-destructive detection, information encryption, bio-imaging, and NIR remote control. This work offers a novel perspective for developing high-performance NIR phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）