OPTICAL MATERIALS
·
2017
·
IF 2.238
Renping Cao,Jinlong Zhang,Wudi Wang,Ting Chen,Qingdong Gou,Yufeng Wen,Fen Xiao,Zhiyang Luo
Novel deep red-emitting Ca 3 Al 4 ZnO 10 :Mn 4+ (CAZO:Mn 4+ ) phosphor is synthesized by high-temperature solid-state reaction method in air. The crystal structures and optical characterizations of the phosphors are described. X-ray diffraction patterns indicate that all samples are a pure phase. CAZO:Mn 4+ phosphor with excitation 330 and 465 nm exhibits strong deep red emission in the range of 650–790 nm. CAZO:Mn 4+ phosphor can be efficiently excited by near-ultraviolet and blue light from 300 to 500 nm. The optimal Mn 4+ ion concentration in CAZO:Mn 4+ phosphor is ∼0.6 mol%. Lifetimes of CAZO:xMn 4+ (0.3 ≤ x ≤ 1.8 mol%) phosphors decrease from 1.95 to 1.56 ms with increasing Mn 4+ ion concentration in the range of 0.3–1.8 mol%. The paper content is help to develop other Mn 4+ ion doped luminescence materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2014
·
IF 2.075
Renping Cao,Fenxiang Zhang,Chunyan Cao,Xiaoguang Yu,Aihui Liang,Siling Guo,Hongdong Xue
CaAl 2 − y O 4 : y Mn 4+ ( y = 0–1.6 mol%) phosphors are synthesized by a solid-state reaction method in air, and their crystal structure and luminescence property are investigated. To compare luminescence property, CaAl 3.99 O 7 :1%Mn 4+ and SrAl 1.99 O 4 :1%Mn 4+ phosphors are also synthesized at the same condition. Broad band excitation spectra are observed within the range 220–550 nm, and emission spectra cover from 600 to 720 nm with the strongest emission peak at ∼658 nm owing to the 2 E → 4 A 2 transition of Mn 4+ ion. The influence of crystal field to luminous intensity is discussed, and the possible luminous mechanism of Mn 4+ ion is explained by using energy level diagram of Mn 4+ ion. CaAl 1.99 O 4 :1%Mn 4+ , CaAl 3.99 O 7 :1%Mn 4+ , and SrAl 1.99 O 4 :1%Mn 4+ phosphors under excitation 325 nm light emit red light, and their CIE chromaticity coordinates are (0.7181, 0.2813), (0.7182, 0.2818), and (0.7198, 0.2801), respectively. These contents in the paper are helpful to develop novel and high-efficient Mn 4+ -doped phosphor for white LEDs.
研究领域:
材料科学
·
光学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Renping Cao,Xinyu Cheng,Lei Su,Ting Chen,Siling Guo,Guotai Zheng,Hui Ao,Wensheng Li
Mg 2 La 2 SnO 7 :Mn 4+ phosphor is synthesized by the solid-state reaction method in air. Monitored at 706 nm, excitation spectrum of Mg 2 La 2 SnO 7 :Mn 4+ phosphor including peaks at ∼ 300, 333, 395, and 516 nm can be observed in the range of 220–600 nm. With excitation at 333 nm, emission band of Mg 2 La 2 SnO 7 :Mn 4+ phosphor is shown in the range of 640–780 nm owing to the 2 E → 4 A 2 transitions of Mn 4+ ion. The optimal Mn 4+ ion concentration is ∼ 0.3 mol% in Mg 2 La 2 SnO 7 :Mn 4+ phosphor. The lifetime decreases from 1.23 to 0.83 ms with the increase of Mn 4+ concentration from 0.1 to 1.2 mol%. There is only one luminescence center (Mn 4+ ) in Mg 2 La 2 SnO 7 :Mn 4+ phosphor, which is confirmed by the luminescence properties, decay curves, and time-resolved emission spectra. Mg 2 La 2 SnO 7 :Mn 4+ phosphor has good thermal stability. Luminous mechanism is explained by energy level diagram of Mn 4+ ion and the thermal quenching phenomenon is analyzed by the configuration coordinate diagram of Mn 4+ ion.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Renping Cao,Binhui Zhong,Jingheng Nie,Lei Zhang,Yuyu Chen,Lan Li,Ting Chen,Jing Wang
Researchers usually co-dope other ions in Mn 4+ doped phosphors to improve and regulate their luminescence properties for the improvement of their practicality. Here, we synthesize SrLa 2 Al 2 O 7 :R (R Dy 3+ , Mn 4+ , and Dy 3+ /Mn 4+ ) samples by solid-state method in air. The crystal structure and phase purity are confirmed by XRD patterns of samples. We investigate the morphology, luminescence properties, optimal doping concentration of Dy 3+ and Mn 4+ ions, lifetimes as well as the energy transfer from Dy 3+ to Mn 4+ ions. We observe yellow emission of SrLa 2 Al 2 O 7 :Dy 3+ under excitation 355 nm in the region from 450 nm to 650 nm with chromaticity coordinates (0.4684, 0.5035) due to the 4 F 9/2 → 6 H 15/2 and 6 H 13/2 transitions of Dy 3+ ion. SrLa 2 Al 2 O 7 :Mn 4+ under excitation 355 nm emits far-red light in the region from 650 nm to 810 nm with chromaticity coordinates (0.7141, 0.2858) due to the transition 2 E g → 4 A 2g of Mn 4+ ion. SrLa 2 Al 2 O 7 :4mol%Dy 3+ , 0.5mol%Mn 4+ under excitation 355 nm contains the emission of both Dy 3+ and Mn 4+ , and shows red emission with chromaticity coordinates (0.5899, 0.4055). The energy transfer process from Dy 3+ to Mn 4+ ions in SrLa 2 Al 2 O 7 :Dy 3+ , Mn 4+ is verified by the spectral characteristics. The luminous mechanisms of samples are analyzed by energy level diagrams of Dy 3+ and Mn 4+ ions.
研究领域:
材料科学
·
光物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 13
·2480-2487
·
IF 5.066
E. H. Song,J. Q. Wang,S. Ye,X. F. Jiang,M. Y. Peng,Q. Y. Zhang
A novel red fluoroaluminate phosphor, cryolite Na3AlF6:Mn4+, has been designed and synthesized via a facile two-step method at room temperature. Under blue light excitation, it exhibits intense sharp line red fluorescence (∼630 nm) with high color purity. The crystal structure, morphology and doping concentration of the samples were characterized in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM) and ICP-AES. The influence of synthesis conditions, raw materials and doping concentration on crystal structure and photoluminescence (or decay behavior) has been investigated carefully. The optimal composition, Na3AlF6:1.58%Mn4+, shows a bright red light and excellent thermal stability (∼99.93% of the emission intensity at 200 °C relative to 23 °C) upon ∼467 nm blue light excitation. A warm high-power white LED with a high color rendering index (Ra = 92.7 and R9 = 94) and low color temperature (CCT = 3903 K) was fabricated based on the blue InGaN chip, commercial yellow phosphor YAG:Ce3+ and red phosphor Na3AlF6:Mn4+.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2023
·Vol. 12
·期 7
·076018
·
IF 2.2
Xuan Gu,Xiao-Yu Sun,Zheng He
Mn4+ doped BaLa2Al2O7 phosphors were developed after a sintering process at 1400 °C for 3 h. The phase and luminescence performance of them were researched. The XRD patterns confirm single phase of the Mn4+ doped BaLa2Al2O7 phosphors. Upon the UV light excitation, the Mn4+ doped BaLa2Al2O7 phosphors emit strong deep-red emission. The concentration-dependence emission spectra demonstrate that the critical concentration for Mn4+ ion in BaLa2Al2O7 host is 0.006. On the basis of the temperature-dependence emission spectra, the activation energy for Mn4+ has been calculated as 0.292 eV, which suggests excellent thermostability of the Mn4+ activated BaLa2Al2O7 phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 20
·6738-6745
·
IF 4.052
Yibo Chen,Conghua Yang,Meiping Deng,Jin He,Yiqin Xu,Zhao-Qing Liu
As a potential far-red-emitting candidate for plant growth LEDs, Mn4+ activated oxide phosphors have brand-new application prospects. However, it remains a significant challenge to develop highly efficient far-red-emitting phosphors due to their intrinsic energy loss in a large Stokes shift. Herein, we present a rational charge compensation strategy with a fusible charge compensator MgF2 at the molecular level to synthesize a LaAlO3:Mn4+,Mg2+ far-red-emitting phosphor. Notably, MgF2 can play an essential role in the incorporation of Mn4+ into the crystal matrix during the high-temperature solid-state reaction process, and thus induce a highly luminescent phosphor with a quantum yield of 78.6% and appropriate thermal stability. The fabrication of a high-performance far-red-emitting phosphor-converted LED further identifies the application potential of the modified Mn4+ activated LaAlO3 phosphor. This finding sheds light on the further exploration of high-grade far-red phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Yibo Chen,Jin He,Xinguo Zhang,Mingcong Rong,Zhiguo Xia,Jing Wang,Zhao-Qing Liu
There is a challenge for noncontact temperature-sensing techniques and the related materials, in which a highly reliable contactless thermometer probe with low cost and high sensitivity is in demand. Here, the Lu3Al5O12:Ce3+/Mn4+ phosphor has been designed and prepared for the high-performance fluorescence temperature-sensing application in a novel one-pot, self-redox, solid-state process. Benefiting from the different electron–lattice/phonon interactions of Ce3+ and Mn4+, two distinguishable emission peaks with significantly different temperature responses originating from Ce3+ and Mn4+ are realized. Applying the fluorescence intensity ratio of Mn4+ versus Ce3+ and the decay lifetime of Mn4+ emission as the temperature readout, a dual-mode optical temperature-sensing mechanism was proposed and studied in the temperature range of 100–350 K. The maximum relative sensitivities (Sr) are derived as 4.37 and 3.22% K–1 respectively, as well as a large chromaticity shift visible to naked eyes (ΔE = 153 × 10–3 in 100–350 K) is observed. This is the first report of a Ce3+,Mn4+ co-doped dual-emitting phosphor, and its unique optical thermometric features demonstrate the high potential of Lu3Al5O12:Ce3+/Mn4+ as an accurate and reliable thermometer probe candidate.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 12
·4685-4694
·
IF 4.569
Guixian Li,Yu Xue,Qinan Mao,Lang Pei,Hong He,Meijiao Liu,Liang Chu,Jiasong Zhong
Luminescent thermometers provide a non-contact method of probing temperature with high sensitivity and response speed at the nanoscale. Synergistic photoluminescence from different activators can realize high sensitivity for luminescent thermometers by finely selecting ions with specific crystallographic sites. Herein, the more temperature-sensitive Mn4+ and the less-sensitive Eu3+ (or Sm3+) activators are co-doped into a Ca2GdSbO6 matrix to form an effective thermometer, where Mn4+ and Eu3+ (or Sm3+) ions occupy the Sb5+ and Gd3+ sites, respectively. The co-doping of Eu3+ ions or Sm3+ ions leads to lattice expansion of Ca2GdSbO6 matrix and a tuned narrow emission from deep-red to orangish-red. According to the ratio of luminescence intensity, the maximal Sa and Sr values are 0.19 K−0 (347 K) and 1.38% K−( (420 K) for Ca2GdSbO6:Mn4+/Eu3+ probe and 0.26 K−p (363 K) and 1.55% K−( (430 K) for Ca2GdSbO6:Mn4+/Sm3+ probe thermometers, respectively. In addition, thermometers based on Mn4+ emission lifetimes can provide the highest relative sensitivity of 1.47% K−s at 425 K. Thus, the highly-temperature-sensitive Ca2GdSbO6:Mn4+/(Eu3+ or Sm3+) phosphor is a promising candidate for practical luminescence thermometers.
研究领域:
材料科学
·
无机化学
·
光学材料
·
纳米技术
·
生物传感
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Renping Cao,Jinlong Zhang,Wudi Wang,Zuofu Hu,Ting Chen,Yuanxiu Ye,Xiaoguang Yu
Li 2 Mg 3 SnO 6 :Mn 4+ deep red phosphor is synthesized by high-temperature solid-state reaction method in air. With excitation 330 and 480 nm, the emission band peaking at ∼670 nm within the range 600–790 nm is observed owing to the 2 E → 4 A 2 transition of Mn 4+ ion. Excitation bands peaking at ∼330, 395, and 480 nm in the range of 220–600 nm indicate that Li 2 Mg 3 SnO 6 :Mn 4+ phosphor can be effectively excited by (near) ultraviolet and blue light-emitting diode chips. The optimal Mn 4+ ion concentration is ∼0.4 mol%. Fluorescence lifetime and quantum efficiency of Li 2 Mg 3 SnO 6 :0.4%Mn 4+ phosphor with excitation 330 nm are ∼266.67 μs and 36.3%, respectively. The luminous mechanism is explained by the Tanabe-Sugano energy level diagram of Mn 4+ in the octahedron.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Renping Cao,Yuming Jiao,Xuantian Wang,Xun Ouyang,Huijun Wan,Ting Chen,Guotai Zheng,Shikun Xie
Novel Mg 2 La 3 NbO 9 :Mn 4+ powder phosphors are successfully synthesized by the high-temperature solid-state reaction method under ambient air. The crystal structure, morphology, decay lifetimes, time-resolved emission spectra, and luminescence properties are investigated. The excitation spectrum of Mg 2 La 3 NbO 9 :Mn 4+ phosphor monitored at 708 nm is observed in the region from 210 nm to 600 nm. Mg 2 La 3 NbO 9 :Mn 4+ phosphor with excitation at the ultraviolet (UV) and blue light can emit the far-red emission with the emission band peaking at ~708 nm because of the 2 E → 4 A 2 transition of Mn 4+ and the corresponding chromaticity coordinates (0.7322, 0.2678). The optimal doping concentration of Mn 4+ ion is ~0.6 mol%. The decay lifetime of Mg 2 La 3 NbO 9 :xMn 4+ phosphors decrease from 1.143 ms to 1.099 ms with increasing the Mn 4+ ion concentration from 0.2 mol% to 1.0 mol%. The good thermal stability of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is confirmed by the temperature-dependent emission spectra. The luminous mechanism of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is explained by using the Tanabe Sugano energy level diagram of Mn 4+ ion. All the experimental results imply that Mg 2 La 3 NbO 9 :Mn 4+ phosphor has a potential application in the white light-emitting diodes (LEDs) field.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Feilong Liu,Yingyuan Chen,Bojana Milićević,Chunyan Jiang,Senchuan Huang,Lei Zhou,Jianbang Zhou,Mingmei Wu
A facile strategy to modify the surface of K 2 SiF 6 :Mn 4+ (KSFM) with commercially available hydrophilic hydroquinone (HQ) has been developed and waterproof stability (moisture resistance) of the KSFM has been significantly improved. It has been demonstrated that there are strong interactions between KSFM and HQ on the interface due to the hydrogen bonds of fluorine in KSFM with hydrogen in HQ. The relative luminous intensity of HQ-modified KSFM (denoted as KSFM-HQ) remained 99.7% of its initial value after immersion in water for 336 h, remarkable higher than that of KSFM which remained only 38.0%. It is proposed that the high water resistance of KSFM-HQ is achieved via two possible mechanisms: in situ decomposition of dark brown manganese (owing to the hydrolysis of [MnF 6 ] 2− ) on the KSFM crystal surface and consequently the formation of a more protective Mn 4+ -free layer. The process effectively combines the advantages of transparent organic materials (herein HQ) before immersion in water and durable moisture resistance of inorganic materials (herein K 2 SiF 6 ) on surface after immersion in water. The importance of HQ loading on moisture-sensitive fluoride phosphors has been further confirmed by using HQ-treated K 2 GeF 6 :Mn 4+ (KGFM) as an additional example. This strategy provides a one-of-a-kind way to the development of water-resistant Mn 4+ -doped fluoride phosphors with high luminous stability for potential applications in water-borne fluorescent anti-counterfeiting ink and even warm WLEDs operating in high humidity.
研究领域:
材料科学
·
化学
·
光电技术
·
荧光粉技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）