Materials Research Express
·
2021
·Vol. 8
·期 10
·105002
·
IF 1.62
Wenchang Xi,Pan Jian,Xisong Mao,Deyang Ning,Xuewen Xia,Guohua Liu,Dongyang Shi,Yuanpei Lan
In this work, aiming to evaluate and compare the luminescent property of Eu3+ doped La(OH)3 nanorods and its decomposed compounds of LaOOH and La2O3, La(OH)3: Eu3+ nanorods were synthesized and the decomposition behaviors in air and hydrogen were revealed. Then the luminescent property of 0%–8% Eu3+ doped La(OH)3 nanorods and the 300 °C–800 °C calcined La(OH)3: Eu3+- 4% were studied. Results show that LaOOH is intermediate product during the degradation of La(OH)3 in air or H2, which can be formed at a temperature range in 372.3 °C–592.9 °C in air. Intensity of emission spectra of La(OH)3: Eu3+ nanorods increases with the rising of Eu3+ dopant concentration, and the emission property of Eu3+ doped LaOOH and La2O3 is varied and strengthened with that of La(OH)3: Eu3+. Luminescent matrixes of LaOOH and La2O3 show similar emission spectrum and intensity, and the transitions of the D0 → 7F1 and D0 → 7F2 of Eu3+ each bifurcate into two peaks for both europium (III) doped La2O3 and LaOOH. The revealed results suggest that LaOOH is a relative thermal-stable compound and should be an appropriate matrix as similar as La2O3 for luminescent applications.
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高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Shaokun Ling,Yaxiong Wang,Xiaoyan Qin,Chang Chen,Chunchun Lu,Jidong Chen,Sen Liao,Yingheng Huang,Lei Hou
Although being applied in various fields, white light emitting diodes (WLEDs) still have drawbacks that urgently need to be conquered: the luminescent intensity of commercial phosphors sharply decreases at working temperature. In this study, we calculated the forming energy of defects and confirmed that the VNa defect state can stably exist in β-NaGdF4, by density functional theory (DFT) calculation. Furthermore, we predicted that the VNa vacancies would provide a zero thermal quenching (ZTQ) property for the β-NaGdF4-based red-light phosphor. Then, a series of β-NaGdF4:xEu3+ and β-NaGdF4:0.25Eu3+,yYb3+ red-light phosphors were synthesized by the hydrothermal method. We found that β-NaGdF4:0.25Eu3+ and β-NaGdF4:0.25Eu3+,0.005Yb3+ phosphors possess ZTQ properties at a temperature range between 303–483 K and 303–523 K, respectively. The thermoluminescence (TL) spectra were employed to calculate the depth and density of the VNa vacancies in β-NaGdF4:0.25Eu3+ and β-NaGdF4:0.25Eu3+,0.005Yb3+. Combining the DFT calculation with characterization results of TL spectra, it is concluded that electrons stored in VNa vacancies are excited to the exited state of Eu3+ to compensate for the loss of Eu3+ luminescent intensity. This will lead to an increase of luminescent intensity at high temperatures and facilitate the samples to improve ZTQ properties. WLEDs were obtained with CRI = 83.0, 81.6 and CCT = 5393, 5149 K, respectively, when phosphors of β-NaGdF4:0.25Eu3+ and β-NaGdF4:0.25Eu3+,0.005Yb3+ were utilized as the red-light source. These results indicate that these two phosphors may become reliable red-light sources with high antithermal quenching properties for WLEDs.
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PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70155
·
IF 0
Guoxu Qin,Jiali Wang,Yaqiong Kong,Rong Wu,Duojun Cao,Xiangzi Li,Xiaoyong Xu
Organophosphorus pesticides (OPs) are widely used worldwide. However, OPs residues can cause serious health problems. Traditional analytical approaches for OPs detection fail to offer simple, real-time, and visualization. Herein, Ultrathin Eu 3+ @Cd-MOF nanosheets with a thickness of 6 nm were synthesized via a simple solution route. Due to the antenna effect between 4,4′-dicarboxydiphenyl ether (H 2 OBA), 2,2′-bipyridine (BPY), and Eu 3+ , the as-prepared nanosheets displayed characteristic fluorescence emission of Eu 3+ ions at 616 nm under the excitation of 323 nm. The strong fluorescence was quenched by p-nitrophenyl phosphate (PNPP) without any interference from other pesticide in aqueous systems; Eu 3+ @Cd-MOF nanosheets can serve as a highly sensitive probe for visualizing fluorescence and detecting PNPP in water systems with a low LOD of 65 nM and a rapid response time of 20 s. A systematic investigation of the sensing mechanism indicated that the combination of the photoelectron transfer (PET) and the inner filter effect (IFT) resulted in the selective detection of PNPP. The luminescence detection approach offers a rapid, low-cost, and visualized detection method for PNPP remaining on fruits and vegetables surfaces.
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BULLETIN OF MATERIALS SCIENCE
·
2024
·Vol. 47
·期 2
·1-10
·
IF 1.9
Ru Jingjing,Zhao Bing,Zeng Fan,Guo Feiyun
A set of colour tuning K 2 Ba(MoO 4 ) 2 : Dy 3+ /Eu 3+ (KBM: Dy 3+ /Eu 3+ ) phosphors were fabricated by solid-state method. The phase purity of as-prepared materials was validated by XRD and DRS analyses. The KBM: 0.03Dy 3+ sample exhibits two major luminescence lines at 481 and 572 nm when excited by 351 nm light, corresponding to Dy 3+ ions’ typical transitions of 4 F 9/2 → 6 H J (J = 15/2, 13/2). By introducing Eu 3+ ions into KBM: 0.03Dy 3+ phosphor, the ET from Dy 3+ to Eu 3+ ions arises, leading to colour tuning from green via yellowish green to pink with changing Eu 3+ ions’ concentration, along with the lowest CCT of KBM: 0.03Dy 3+ /0.03Eu 3+ sample. It can be verified by PLE and PL spectra analysis combined with the decay times of KBM: 0.03Dy 3+ /yEu 3+ samples. The energy transfer mechanism is also expounded. Meanwhile, the emission intensities at 423 K still maintain 72.8% for Dy 3+ ions and 91.2% for Eu 3+ ions relative to 303 K of the KBM: 0.03Dy 3+ /0.03Eu 3+ sample, displaying its brilliant thermal stability. All these results connote that KBM: Dy 3+ /Eu 3+ phosphors are prospected to be used for the near-UV excited white light-emitting diodes.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fang Fang,Yuanhao Chen,Boyan Liu,Xiaoshan Zhang,Benchun Li,Dawei Zhang,Dechao Yu
Red-emitting phosphors efficiently excited by near-ultraviolet (NUV) light are desired for high-quality phosphor-converted white LED (pc-WLED) devices. In this work, Eu 3+ /Tb 3+ codoped NaBiF 4 phosphors were designed as promising NUV-excitable candidates for the red component in pc-WLEDs. Under 379 and 395 nm excitation, the NaBiF 4 :Eu 3+ ,Tb 3+ samples yield intense red emissions, predominantly at 616 nm due to the 5 D 0 → 7 F 2 transition of the Eu 3+ ion. The Tb 3+ dopants bring in synergistic effects in greatly enhancing the Eu 3+ red luminescence, i.e. resonant energy transfer (ET) from Tb 3+ to Eu 3+ and crystal field perturbation surrounding Eu 3+ . The relevant spectroscopic properties were systematically studied using steady-state and time-resolved fluorescence spectroscopy. The optimized NaBiF 4 :20%Eu 3+ ,15%Tb 3+ sample features a nearly complete Tb 3+ → Eu 3+ ET, leading to a pure Eu 3+ red luminescence, and showing quantum yield values of 44.2% and 51.6% upon 379 and 395 nm excitation, respectively. Notably, the red luminescence from the NaBiF 4 :20%Eu 3+ ,15%Tb 3+ system has a high thermal stability, which at 398 K sustains 80.2% of its room-temperature luminescence intensity under 395 nm excitation. Via coating a mixture of commercial BaMgAl 10 O 17 :Eu 2+ blue- and (Ba,Sr) 2 SiO 4 :Eu 2+ green-emitting phosphors and the optimized phosphor on NUV ∼ 380 and 395 nm LED chips, the homemade 395 nm-excited pc-WLED exhibited interesting warm lighting performance, i.e. color rendering index (Ra) ∼ 90 and correlated color temperature (Tc) ∼ 3884 K, while the 380 nm-excited pc-WLED had Ra ∼88 and Tc ∼ 4685 K. That is, the NUV ∼395 nm chip (illumination also overlapping with the Tb 3+ absorption around 380 nm) is practically preferable to excite the Tb 3+ /Eu 3+ pc-LED for high-qualified warm white lighting. All the results unveil the viable schemes to develop the Eu 3+ /Tb 3+ co-activated red-emitting phosphors, offering promising prospects for novel NUV-excitable pc-WLED light sources.
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高影响因子
Materials Chemistry Frontiers
·
2025
·
IF 6.4
Lanxuan Yang,Lili Liu,Xu Ding,Ruili Xu,Tian Tian,Zhifu Liu,Lianjiang Tan,Yaoqing Chu
The asymmetry of the local environment within host materials plays a critical role in enhancing the emission performance of Eu3+ ions. In this study, we introduced a novel Si4+-doping strategy to optimize the luminous properties of Eu3+ ions by promoting asymmetry in the local lattice environment. And then, a series of Si4+/Eu3+ co-doped Sr3Ga2Ge4O14 phosphors were synthesized. Our findings reveal that Si4+-doping at a concentration of 60 mol% significantly enhances the emission intensity of Eu3+ ions in the Sr3Ga2Ge4O14 host by approximately 80%. Also, the internal quantum efficiency increases from 37.80% to 49.04%, alongside a rise in color purity from 87.40% to 99.80%. Utilizing this Sr2.3Ga2Ge1.6Si2.4O14:0.7Eu3+ high-performance red phosphor, we fabricated a white light-emitting diode (WLED) device with natural white light characteristics, achieving CIE coordinates of (0.338, 0.323), a correlated color temperature (CCT) of 5636 K, and a color rendering index (CRI) of Ra = 89.4. Additionally, we developed a high-performance anti-counterfeiting ink using this red phosphor, which adheres uniformly to surfaces with varying roughness and delivers exceptional luminescence effects. This study provides new insights into the development of advanced red-emitting phosphors for applications in lighting and anti-counterfeiting technologies.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Fengping Ruan,Degang Deng,Ming Wu,Bowen Chen,Ruoshan Lei,Shiqing Xu
Eu 2+ /Eu 3+ co-doped Ca 9 Mg 1.5 (PO 4 ) 7 phosphors are prepared through a convenient solid phase reaction , and their optical characteristics were studied to investigate the possible applications in luminescence thermometric field. The conformation of Eu 2+ and Eu 3+ dual-emitting centers in Ca 9 Mg 1.5 (PO 4 ) 7 host was veritied by X-ray photoelectron spectroscopy , photoluminescence spectra and decay curves. In Eu 2+ /Eu 3+ co-activated Ca 9 Mg 1.5 (PO 4 ) 7 thermometric phosphor, not only the Eu 2+ -blue emission and Eu 3+ -red emission, but also the double-sites emissions in blue and red regions of Eu 2+ ions can be used as FIR signals. Moreover, the exhaustive mechanism is discussed in depth with the measured data, and the intense temperature dependence is interpreted in the light of thermal-quenching. Additionally, benefited from their diverse thermal quenching behavior, the fluorescence intensity ratio (FIR) of Eu 3+ to Eu 2+ displays remarkable linear temperature-dependent and the maximum sensitivity is 8.40 × 10 −5 K −1 for the obtained phosphors. Moreover, the FIR of Eu 2+ ( I 600 ) to Eu 2+ ( I 415 ) is fitted very well, and the maximum value of S r is 1.192% K −1 at 383 K, as well as the value of S a is 0.064 K −1 . As a consequence, this work indicates that Ca 9 Mg 1.5 (PO 4 ) 7 : Eu 2+ /Eu 3+ phosphors could be widely applied in optical temperature sensors.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 20
·6715-6723
·
IF 7.059
Xiaohui Li,Lei Zhou,Junyu Hong,Shiman He,Xiping Jing,Miroslav D. Dramićanin,Jianxin Shi,Mingmei Wu
Modulation of structural order–disorder transition and structural oxygen defects can provide fundamental insights in the optimization of luminescence performances of phosphors. In this study, the luminescence of Ba3ZnTa2O9 (BZT) was systematically elucidated, including the emission arising from the charge transfer (Nb5+/Ta5+ → O2−) and anti-site oxygen defect emission due to the B-site disordering (defect type: [2ZnNb3− + 3Vo2+]), as corroborated by the electronic structural calculations and detailed experiments. We present a two-step design for the optimization of luminescence properties of Ba3ZnTa2O9 phosphor. In the first step, the B-site equivalent doping (Ta5+ substituted by Nb5+) was used to modulate the B-site atomic arrangement, which induced the formation of the cubic phase with B-site full disordering. In the second step, the A-site nonequivalent doping (Ba2+ substituted by Eu3+) was used to decrease the oxygen defect concentration. After the two-step optimization, the photoluminescence excitation spectrum of Ba3−yEuyZnNb2O9 (y = 0.1) shows a broad band excitation (300–400 nm), which is a good match with the near-UV LED chip emission. Even more importantly, the emission spectrum covers the entire visible spectral region and exhibits a remarkably enhanced emission intensity (a 40 times enhancement when compared to that of the intrinsic BZT). The fabricated LED device comprising an n-UV chip (λ = 370 nm) and a single-component Ba3−yEuyZnNb2O9 (y = 0.1) phosphor coating emits a warm white light with a low correlated color temperature (CCT = 4813 K) and a good color rendering index (Ra = 82.36).
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高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 18
·期 11
·2400283
·
IF 9.8
Xuexia Chen,Ran Pang,Shangwei Wang,Tao Tan,Jiangyue Su,Weihong Yuan,Su Zhang,Hongjie Zhang
Traditional anti-counterfeiting luminescent phosphors are usually composed of single-mode photoluminescence materials, which greatly limits the security of encryption by its static fluorescent pattern. Herein, multi-mode luminescence properties are achieved including fluorescence and persistent luminescence (PersL) within single host by co-doping Bi 3+ and Eu 3+ in CaNaSb 2 O 6 F (CNSOF). A tunable emission is observed from blue (Bi 3+ , 3 P 1 → 1 S 0 ) to white and then to orange-yellow (Eu 3+ , 5 D 1 → 7 F 2 and 5 D 0 → 7 F 0, 1, 2, 3, 4 ) as the excitation schemes, environment temperatures and doping level are modulated. Impressively, the blue emission attributed to the Bi 3+ rapidly disappears after stopping the excitation light irradiation, and only the intense orange-yellow PersL produced by Eu 3+ can be observed. And a possible model for the energy transfer and PersL mechanism is proposed by the investigation crystal structure and photoluminescence/PersL. A schematic of security logo and digital information encryption is demonstrated using the prepared samples, which shows the dynamic evolution of the emission color and PersL brightness. The excellent property of multiple color outputs, different decay processes, and external field stimulation modes (including low energy light, thermal, and mechanical stimuli) present in CNSOF:Bi 3+ , Eu 3+ provides a fast, low-cost, and effective method for advanced anti-counterfeiting and information encryption applications.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Shaoxing Guo,Pengyun Chen,Limei Song,Ping Guo,Jianhua Gao
A new mixed-anion phosphate crystal Cs 2 Bi 2 Sr(P 2 O 7 )(PO 4 ) 2 was obtained by molten salt method. Single-crystal X-ray diffraction data demonstrated that the compound crystallizes in monoclinic space group P 2 1 /c (No.14) with unit cell parameters a = 17.708(10) Å, b = 9.156(5) Å and c = 9.221(5) Å, β = 90.160(8) °. The structure exhibits a novel three-dimensional network, which is made up of BiO 6 , BiO 5 , SrO 6 and CsO 11 polyhedra sharing the corners with PO 4 tetrahedra and P 2 O 7 diphosphate groups. The band gap was estimated by the combined density functional theory and experimental study. Photoluminescence property of Cs 2 Bi 2- x Sr(P 2 O 7 )(PO 4 ) 2 : x Eu 3+ showed the excellent thermal stability and high quantum efficiency .
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高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Min Zhang,Jianming An,Yue Li,Edwin Yue Bun Pun,Hai Lin
Novel Eu 3+ -doped Cs 2 KInCl 6 double perovskite exhibits ultrabroadband emission, enabling efficient multicolor luminescence covering the entire visible spectrum with a single luminescent center. This behavior originates from the intrinsically low phonon energy of the host, which effectively suppresses multi-phonon relaxation (MPR) and consequently reshapes the radiative pathways of Eu 3+ . As a result, its stepwise population accumulation occurs along the excited-state energy ladder, promoting multiple radiative transitions. Based on this kinetic behavior, the rare coexistence of blue ( 5 D 3 → 7 F 4 ), green ( 5 D 2 → 7 F 3 ), yellow ( 5 D 1 → 7 F 2 ), and red ( 5 D 0 → 7 F 2 ) emissions are achieved with large emission cross-sections of 2.00 × 10 −22 , 4.75 × 10 −22 , 5.48 × 10 −22 , and 8.18 × 10 −22 cm 2 , respectively. These emissions are further validated by high fluorescence branching ratios exceeding 40%, confirming the efficiency of the corresponding radiative channels and their collective contribution to multipeak full-spectrum emission. In addition, the phosphors demonstrate pronounced thermal responsiveness in the temperature range of 303 – 433 K, together with dynamically tunable emission, supporting their applications in high-sensitivity optical thermometry, dynamic anti-counterfeiting, and high-quality lighting. Overall, this work suggests that ultralow-phonon-energy perovskite provides an effective platform for achieving multiple excited-state radiative transitions, thus offering a research foundation for developing functional optical materials and next-generation photonic devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Liang Yang,Jianwei Dao,Zhihao Jiang,Tiqun Wei,Zihao Han,Yajie Deng
Narrow-band red phosphors offer highly effective solution to the red-spectral deficiency that has long compromised the color rendering quality of phosphor-converted white light-emitting diodes (LEDs). Herein, we report novel tungstate-based Na 5 Lu(WO 4 ) 4 :Eu 3+ (NLWO:Eu 3+ ) red phosphor synthesized by high-temperature solid-state reaction. The distinctive tetragonal framework of the Na 5 Lu(WO 4 ) 4 host provides non-centrosymmetric Lu 3+ sites that favor the hypersensitive 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ , yielding an exceptionally pure red emission at 618.9 nm with a remarkable color purity of 96.22%. A systematic investigation of the concentration-dependent luminescence reveals that electric dipole-dipole interactions dominate the energy transfer and quenching behavior, with the optimal Eu 3+ content identified at x = 0.21. Importantly, the phosphor retains 78.7% of its room-temperature emission intensity at 423 K, corresponding to activation energy of 0.246 eV, indicative of robust thermal stability suitable for LED application. A full-spectrum white LED device was constructed by integrating the optimized NLWO:Eu 3+ phosphor with commercial blue and green components on 397 nm n-UV chip. The device delivers high-quality white light with a high general color rendering index (Ra = 87.5) and a markedly enhanced R9 value of 89.8, far exceeding that of conventional YAG:Ce-based white LEDs, along with comfortable correlated color temperature of 6038 K. This work presents a viable red phosphor solution for bridging the red gap in full-spectrum lighting, highlighting the potential of tungstate hosts as robust platforms for high-performance phosphor development.
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高影响因子
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