Materials Today Chemistry
·
2023
·
IF 7.3
Zhihao Zhang,Huimin Li,Ran Pang,Wenjing Wang,Da Li,Lihong Jiang,Su Zhang,Hongjie Zhang
Afterglow materials exhibit distinct temperature-dependent luminescence compared to general optical materials due to the presence of extra unique energy transfer paths from traps to luminescent centers. These paths include: 1) energy transfer through the conduction band (CB), and 2) energy transfer via quantum tunneling channels to various energy levels. These have a notable impact on both the overall intensity and the relative intensity of emission at different temperatures, which is often unintentionally overlooked. To investigate the influence of these additional paths on temperature-dependent luminescence, we employed a simple yet effective method of varying the excitation light intensity in Y 2 CaSnGa 4 O 12 :Pr 3+ , an afterglow material. And the influences on optical thermometer and anti-thermal quenching performance were illustrated comprehensively. We ultimately arrived at some interesting and widespread conclusions: 1) The performance of fluorescence intensity ratio (FIR) thermometry, which relies on excitation intensity, can be stabilized by avoiding the presence of charging traps. The high sensitivity of the afterglow intensity ratio (AIR)-based thermometry, which does not require an external light source , may be closely associated with the quantum tunneling process. 2) The performance of trap-assisted anti-thermal quenching is excitation intensity-dependent. We elucidated the specific contribution of traps that had previously been unaccounted for in earlier reports.
研究领域:
发光材料
·
光学测温
·
固体物理
·
光子学
·
材料科学
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 52
·2005626
·
IF 11.459
Yudi Tu,Yan Xu,Junzi Li,Qiaoyan Hao,Xiaosong Liu,Dianyu Qi,Chunxiong Bao,Tingchao He,Feng Gao,Wenjing Zhang
For next-generation Internet-of-Everything applications, for example, artificial-neural-network image sensors, artificial retina, visible light communication, on-chip light interconnection, and flexible devices, etc., high-performance microscale photodetectors are in urgent demands. 2D material (2DM) photodetectors have been researched and demonstrated impressive performances. However, they have not met the demands in filterless narrowband photoresponse, wide linear dynamic range (LDR), ultralow dark current, and large on/off ratio, which are key performances for these applications. 2D Ruddlesden–Popper perovskites (2D-RPPs) are recently highlighted photovoltaic and optoelectronic materials. Embedding ultrathin 2D-RPPs into 2DM photodetectors holds potentials to improve these performances. Herein, a single-crystalline ultrathin (PEA) 2 PbI 4 is integrated into a vertical-stacked graphene-(PEA) 2 PbI 4 -graphene micro photoconductor (V-PEPI-PC). V-PEPI-PC exhibits narrowband photoresponses at 517 nm with a full-width-at-half-maximum of 15 nm and a wide LDR of 122 dB. Due to the multiple quantum wells in (PEA) 2 PbI 4 , V-PEPI-PC demonstrates an ultralow dark current of 1.1 × 10 −14 A (44 pA mm −2 ), a high specific detectivity of 1.2 × 10 13 Jones, and a high on/off ratio of 1.6 × 10 6 . Owing to the short vertical channel, V-PEPI-PC shows a fast response rise time of 486 µs. Therefore, the vertical-stacked photodetectors based on hybrid 2D-RPPs and 2DMs may have great potentials in future optoelectronics.
研究领域:
光电子学
·
纳米材料
·
光子学
·
半导体器件
·
二维材料
·
钙钛矿电子学
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Jinxuan Sun,Wei Wang,Hanrui Liao,Yi Wei,Guogang Li
Superior thermal stability is an essential property of phosphor materials for their practical applications in the white-light-emitting diode (pc-WLED) lighting area. Nevertheless, the development of thermally stable red phosphor remains a challenging issue due to the serious nonradiative transition loss. In this work, a series of red-emitting Eu2W3–xMoxO12 (0.0 ≤ x ≤ 3.0) solid-solution phosphors were synthesized based on high-temperature solid-phase reaction. Surprisingly, the thermal stability property is obviously improved by designing a cationic substitution strategy and adjusting the annealing temperature. Under near-ultraviolet light excitation (395 nm), the emission intensity of Eu2W3O12 and Eu2Mo3O12 at 125 °C is 0.63 and 1.36 times of that at 25 °C, respectively. The emission intensity of Eu2Mo3O12 at 125 °C is increased to 2.16, which exhibits more competitive thermal stability than Eu2W3O12. This unique antithermal quenching enhancement phenomenon is ascribed to the decreased thermal ionization and thermally activated crossover effect energy, resulting from the simultaneously increased optical band gap and activation energy via the cationic substitution strategy. This work proposes a strategy to optimize the thermal stability behavior of red phosphors in pc-WLED applications.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
LED技术
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 24
·40846-40852
·
IF 5.2
Xinrong Chen,Shaoda Yuan,Yanghan Guo,Bingguo Liu,Shiqing Pang,Le Zhang,Baoli Du,Carsten Dam-Hansen,Jian Xu,Ole B. Jensen
Eu 2+ doped-CaAlSiN 3 possesses broad red emission, enabling a phosphor-converted lighting device to achieve a high color rendering index (CRI) and proper color temperature. However, CaAlSiN 3 :Eu 2+ exhibits relatively slow decay (∼1 μs) and intense re-absorption of luminescence from green/yellow emitters, thereby causing optical saturation and reducing the luminous efficacy. Here, we fabricated a novel phosphor converter comprising Lu 3 Al 5 O 12 :Ce 3+ and Y 1.3 Gd 1.6 Al 5 O 12 :Ce 3+ powders. The typical sample, when excited by a blue laser , exhibited a high luminous efficacy of 231 lm/W and a high saturation threshold of 22.2 W/mm 2 , resulting in a high luminous exitance of 695 lm/mm 2 . Importantly, the phosphor converter produced a broad emission band that included sufficient cyan and red components, resulting in a full width at half maximum (FWHM) of 134 nm and a high CRI of 81. With this excellent balance between CRI and luminous efficacy, the reported phosphor converter can significantly expand the range of laser lighting applications.
研究领域:
光学材料
·
固态照明
·
光子学
·
发光
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Yi Wei,Chen Heng,Hang Yang,Peipei Dang,Maxim S. Molokeev,Lixin Ning,Guogang Li
Bismuth (Bi) is used for luminescent materials due to its unique optical performance, but deep-red light from Bi-doped materials is rarely reported. In particular, establishing a design principle for Bi-doped red materials is considered to be a significant challenge. Herein, using a deep-red SrSc2O4:Bi material featuring Bi–Bi pair emission, light-induced charge-transfer from BiSc3+–BiSr3+ to BiSc4+–BiSr2+ enables the realization of Bi2+2P3/2(1) → 2S1/2 deep-red emission. Intriguingly, SrSc2O4:Bi displays an excellent zero-thermal-quenching performance from 298 to 423 K, with a peak intensity that retains 98% of the intensity at 298 K and an integrated intensity at 423 K that even reaches 110% of the initial intensity. The intriguing spectroscopic characteristics of SrSc2O4:Bi make it a promising candidate in the agricultural field, night-vision security, and the medical treatment area. This work advances the understanding of red luminescence in Bi-activated luminescent materials and thus can initiate more exploitation of red materials for emerging applications.
研究领域:
材料科学
·
光学材料
·
固态化学
·
光子学
·
发光学
✓ 已验证
DOI
高影响因子
ACS Photonics
·
2020
·
IF 6.864
Guoen Weng,Jiao Tian,Shengjie Chen,Jiyu Yan,Hanbing Zhang,Yuejun Liu,Chunhu Zhao,Xiaobo Hu,Xianjia Luo,Jiahua Tao,Shaoqiang Chen,Ziqiang Zhu,Junhao Chu,Hidefumi Akiyama
Despite many successful realizations of laser operations in various micro/nanostructured lead halide perovskites (LHPs), the electron–hole plasma (EHP) lasing dynamics has only rarely been reported, especially for wide-gap Cl-rich perovskites. In this work, the temporal lasing dynamics of whispering gallery mode (WGM) CsPbClmBr3–m microplate lasers are systematically investigated, for the first time, with a streak camera system. As the pump fluence increases, the gain profile exhibits a monotonous redshift, indicating the EHP lasing in the microplate cavity, while an opposite shift of the gain region is observed with time decay due to the gradual depletion of carriers. This directly reflects the change of the bandgap renormalization effect at varying pump fluences. Additionally, the individual lasing modes present identifiable blueshifts with elevated pump levels and redshifts with time delay, which can be unraveled by the carrier-induced refractive index change in the LHP cavity. Moreover, the wavelength-dependent lasing duration demonstrates that lasing in the EHP regime depends not only on the carrier density, but also on the bandgap variation with carrier density. By directly modulating the pump fluence, the onset delay of the microlaser can be efficiently tuned. Our results provide a comprehensive understanding of the EHP lasing mechanism and carrier dynamics in the WGM LHP micro/nanolasers and will push their technological relevance in integrated photonics.
研究领域:
光子学
·
光电子学
·
半导体物理
·
纳米光子学
·
激光物理
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2016
·
IF 1.879
Rong Chen,Ying Tian,Bingpeng Li,Feifei Huang,Caizhi Wang,Xufeng Jing,Junjie Zhang,Shiqing Xu
Nd 3+ /Ho 3+ co-doped silicate-germanate glass has been synthesized by high temperature melt-quenching method. Near infrared emission centered at 2 µm has been successfully obtained by incorporating Nd 3+ and Ho 3+ in present glass. The Judd-Ofelt intensity parameters Ω t (t=2, 4, 6), and radiative properties of Ho 3+ were calculated and discussed by using the Judd-Ofelt theory. The energy transfer processes and luminescence properties of Nd 3+ /Ho 3+ co-doped glasses were analyzed pumped by a conventional 808 nm laser diode . Desirable spectroscopic characteristics indicates that Nd 3+ /Ho 3+ co-doped silicate-germanate glass might be a good alternative matrix for 2 µm band mid-infrared laser.
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
激光技术
·
固体物理
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 12
·2400812
·
IF 9.8
Guangyin Qu,Xiaojuan Zhang,Siqi Li,Yan Kuai,Feng Xu,Liang Lu,Yu Liu,Zhigang Cao,Benli Yu,Anderson S. L. Gomes,Zhijia Hu
In contrast to conventional anti-counterfeiting technologies, which are susceptible to decryption and exhibit limited effectiveness, the utilization of light to dynamically configure soft materials in a fully reversible and programmable manner not only enhances data security but also improves anti-counterfeiting performance. However, achieving precise control over reflection structural colors and laser wavelengths within a broad dynamic range remains a challenge. In this study, a UV-responsive soft helical superstructure is established by combining a photochromic compound with chiral liquid crystals (LCs). By manipulating the Bragg reflection angle, structural reflection colors ranging from red to cyan are successfully achieved. The introduction of an anti-counterfeiting technique that embeds diverse micro-structures provides features such as color adjustability, erasability, and angle-dependent stability. Using the unique properties of this soft helical superstructure, the implementation of a wavelength-tunable LC bandgap laser through optically reconfigurable Förster resonance energy transfer processes is showcased. Furthermore, a straightforward prototype information encoder is developed to mimic the processes of information encoding and decoding, bypassing the need for complex algorithm design. This research underscores the practicality of LC helical soft systems, emphasizing their distinctive responsiveness to light and their applicability in optical programming photonics.
研究领域:
光学材料
·
软物质物理
·
光子学
·
信息安全
·
功能材料
·
分子光化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 10
·期 3
·2101843
·
IF 9.926
Ziyu Chen,Jiaxin Yang,Rui Xu,Zejia Zhao,Xu Sang,Lisa Liu,Ming Feng,Feng Song,Yonghong He,Wei Huang
Optical encryption provides a significant implementation strategy for information security, which can be ascribed to multichannel, simple operation, and high security. Multiple responsive luminescent material has emerged as an ideal candidate for optical encryption, owing to intelligent responsive ability and unclonable security. Herein, a structural doping strategy is developed in the layer-by-layer self-assembly process to elevate the maneuverability of light-emitting color and mode. By encapsulating lanthanide doped inorganic matrix and layered hydroxide with PMA, the recognizable red-orange fluorescence can be produced in the invisible region, and realizes the conversion of yellow and green fluorescence in visible region. Meanwhile, both excitation source and emission color can be used as distinguishable encryption means, which enables structural doping complex to be multiplexed and encoded with high capacity and complexity. Furthermore, asymmetrically and symmetrically coded flexible labels with specific color sequence are prepared by brushing process, and specific encryption key are set to ensure the nonlinearity of cryptosystem. Through the integration of dual-mode and adjustable light response codes constructed by structural doping strategy, multidimensional high-level information encryption can be realized, which opens up a deep exploration in the field of information security for the application of multifunctional optical properties of light response materials.
研究领域:
材料科学
·
纳米科技
·
光学工程
·
信息安全
·
功能材料
·
光子学
·
智能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 18
·1251
·
IF 2.8
Zheng Jinjie,Shen Honglie,Li Yufang,Li Hechao,Yue Zhen
Novel efficient visible and near-infrared emitting phosphors NaY(MoO 4 ) 2 (NYM):Ln 3+ (Ln = Ce and Yb) were proposed in this work. The crystal structure, lattice vibration characteristics, morphology, and luminescent properties of NaY(MoO 4 ) 2 phosphors were described. Sensitization of Ln 3+ from the host with various doping concentrations was investigated. The yellow-green emission was achieved in Ce 3+ single-doped NYM phosphors at UV ultraviolet excitation sensitized by the MoO 4 2− group. Under UV excitation, characteristic emissions of Ce 3+ at 400–700 nm and Yb 3+ at 1000 nm of NYM:Ce,Yb were observed, enabling the spectral down-conversion applications. With the increasing concentration of Yb 3+ , the emission intensity as well as the lifetime of Ce 3+ decreased, confirming the energy transfer from Ce 3+ ions to Yb 3+ ions. And the energy transfer coefficient was 27% for NYM:0.01Ce,0.10Yb phosphor. These results indicate that the as-prepared phosphors have potential applications in optical and photonic devices.
研究领域:
材料科学
·
光学材料
·
发光学
·
无机化学
·
光子学
✓ 已验证
DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2013
·Vol. 89
·期 5
·1262-1268
·
IF 2.287
Zhi-Yuan Yan,Bing Yan
Rare earth doped fluorides (BaMgF 4 , aYF 4 and BaYF 5 /BaLuF 5 ) have been synthesized and dispersed in an ionic liquid compound, (3-triethoxysilyl) propyl-3-methylimidazolium chloride (denoted as IM + Cl − ). Through the cohydrolysis and copolycondensatoin reaction between the alkoxy group (3-triethoxysilyl) of IM + and tetraethoxysilane in the presence of carboxylic acids (formic acid) as catalyst and water source, luminescent hybrid ionogels form subsequently. 1 H NMR spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and especially up-conversion (UC) luminescence spectroscopy are used to characterize the precursors and the resulted hybrid ionogels. These hybrid ionogels exhibit the UC luminescence properties of immobilized rare earth fluoride nanocrystals (BaMgF 4 , NaYF 4 and BaYF 5 /BaLuF 5 ) doped Er 3+ /Tm 3+ , Yb 3+ .
研究领域:
材料科学
·
纳米科技
·
无机化学
·
功能材料
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Juping Ma,Yan Sun,Fei Yu,Tianfeng Xue,Lili Hu
Tb 3+ ions doped optical materials have emerged as gain media for green fiber lasers. Dy 3+ ions were proposed as a sensitizer of Tb 3+ ions in glasses to increase the excitation efficiency, yet a systematic understanding of the impact of Dy 3+ doping on spectroscopic and physiochemical properties of glasses remains lacking. Here, using Tb 3+ /Dy 3+ doped fluoride glass as a model system, we reveal that Dy 3+ doping not only enhances Tb 3+ emission intensity, but also increases the thermal stability of fluoride glasses. Detailed spectroscopic characterizations indicate that co-doping Dy 3+ ions boosts visible luminescence intensity of Tb 3+ ions in fluoride glasses due to sensitization of Tb 3+ by Dy 3+ ions. Importantly, we deeply research the energy transfer process , ascertain several important factors affecting energy transfer efficiency and propose optimal doping concentrations of Tb 3+ and Dy 3+ ions for visible emission. We envisage that our finding provides a new perspective for the synthesis of Tb 3+ -doped fluoride glasses with enhanced thermal stability, and may be extended for the fabrication of Tb 3+ -activated optical fibers .
研究领域:
光学材料
·
无机非金属材料
·
光子学
·
稀土掺杂玻璃
·
光纤激光器
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）