Two Ce3+ centers induced broadband emission in Y3Si6N11:Ce3+ yellow phosphor

2018 ◽  
Vol 47 (46) ◽  
pp. 16723-16728 ◽  
Author(s):  
Dashuai Sun ◽  
Liangliang Zhang ◽  
Zhendong Hao ◽  
Xia Zhang ◽  
Guo-Hui Pan ◽  
...  
Keyword(s):  
Emission Band ◽  
Emission Center ◽  
Broad Emission Band ◽  
Yellow Phosphor ◽  
Broadband Emission ◽  
Broad Emission

A Ce2 emission center was found in Y3Si6N11:Ce3+ and the broad emission band was successfully decomposed into Ce1 and Ce2.

Lu3(Al,Si)5(O,N)12:Ce3+ phosphors with broad emission band and high thermal stability for white LEDs

2015 ◽  
Vol 158 ◽  
pp. 322-327 ◽  
Author(s):  
Jiaqing Liu ◽  
Xiaojun Wang ◽  
Tongtong Xuan ◽  
Chunbo Wang ◽  
Huili Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Emission Band ◽  
High Thermal Stability ◽  
Broad Emission Band ◽  
White Leds ◽  
Broad Emission

Absorption, Fluorescence and Emission Anisotropy Spectra of 4-Cyano-N,N-dimethylaniline in Different Media and at Different Temperatures

1997 ◽  
Vol 52 (5) ◽  
pp. 409-414
Author(s):  
A. Kawski ◽  
G. Piszczek
Keyword(s):  
Emission Band ◽  
Effect Of Temperature ◽  
Broad Emission Band ◽  
Fixed Temperature ◽  
Emission Anisotropy ◽  
Paraffin Oil ◽  
Broad Emission ◽  
Negative Emission ◽  
Different Temperatures ◽  
Anisotropy Spectra

Abstract The effect of temperature on fluorescence and emission anisotropy spectra of 4-cyano-N,N-dimethylaniline (CDMA) was investigated in viscous (glycerol and paraffin oil) and rigid (polyvinyl alcohol) PVA and polyvinyl chloride) PVC) media. A strong effect of temperature on the intensity of a and b emission bands was observed. It was also found that the emission anisotropy, r, does not vary in the longwave emission band a at a fixed temperature but decreases in the emission band b together with the decreasing wavelength. The latter effect is due to the fact that the transition moment in this band is perpendicular to the long axis of the CDMA molecule. For CDMA in paraffin oil, a normal b band with negative emission anisotropy only occurs. In all other media used, the emission anisotropy has lower values, approaching zero, which results from the considerable covering of band b with a broad emission band a.

scholarly journals Synthesis and Photoluminescence Properties of Eu3+-Doped Na2YMg2V3O12: A Novel Red-Emitting Phosphor for White-Light-Emitting Diodes

2021 ◽  
Author(s):  
Weiyi Zhang ◽  
Yanqiu Shao ◽  
Ying Zhu ◽  
Yingying Shao ◽  
Zhaohui Huang ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Emission Band ◽  
Red Light ◽  
Solid State Reactions ◽  
Broad Emission Band ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Broad Emission ◽  
Red Emitting Phosphor

Abstract The fabrication and luminescent properties of novel Na2YMg2V3O12:Eu3+ phosphors produced by conventional solid-state reactions were investigated. Self-activated emission of the Na2YMg2V3O12 host produces a broad emission band ranging from 400 to 700 nm with a maximum peak at 530 nm, ascribed to the charge transfer in the (VO4)3− groups. Excitation with near-UV (365 nm) light causes the Na2YMg2V3O12:Eu3+ phosphors to emit bright red light, including both the broad emission band of the (VO4)3− groups and the sharp emission peaks of Eu3+ ions. At a quenching concentration of 0.03 mol, the Eu3+ ion emission peaks were located at 597, 613, 654 and 710 nm. As-prepared Na2YMg2V3O12:Eu3+ phosphors also exhibited stable emission at high temperatures. Furthermore, a designed and packaged white-light-emitting diode (WLED) lamp, including the obtained phosphors, commercial (Ba,Sr)2SiO4:Eu2+ green phosphors, BaMgAl10O17:Eu2+ blue phosphors and a near-ultraviolet (n-UV) chip, emitted bright white light with a good chromaticity coordinate of (0.3068, 0.3491), a satisfactory colour rendering index of 88.20 and a properly correlated colour temperature of 4460.52 K. These results indicate the potential of this Na2YMg2V3O12:Eu3+ phosphor as a red-emitting phosphor for solid-state illumination.

scholarly journals Blue, Green and Yellow Emissions at the Same Time from Mn-doped ZnS Microbelts

2018 ◽  
Vol 34 (1) ◽  
Author(s):  
Nghia Nguyen Van
Keyword(s):  
Emission Band ◽  
Thermal Evaporation ◽  
Wavelength Region ◽  
Broad Emission Band ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
Xrd Pattern ◽  
Broad Emission ◽  
Mn Doped ◽  
Component Phase

We present an investigation of the morphology, structure, composition and optical properties of ZnS:Mn2+ microbelts grown by the thermal evaporation method using ZnS powder and MnCl2.4H2O powder as precursor materials. The SEM images of the products show that ZnS:Mn2+ microbelts are bigger and shorter than ZnS microbelts. EDS reveals that the composition of the microbelts include Zn, S, O, Mn and Cl elements. The atom rate of oxygen composition of the doped microbelts seem to be slightly lower than undoped ones. XRD pattern of the prepared microbelts shows that ZnO coexists with ZnS on the undoped microbelts. However, at the Mn-doped microbelts, the component phase of ZnO is disappeared. Photoluminescence spectra of undoped ZnS microbelts reveal a strong broad emission band at visible wavelength region and a weak ultraviolet band. Interestingly, when Mn2+ is doped into the microbelts, the visible emission band is separated into blue, green, and yellow bands peaking at around 442, 520 nm, and 572 nm, respectively. The effects of Mn2+ ions on the emission bands is discussed in detail.

Traps study of Ca2BO3Cl: Eu2+ Dy3+ long-persistent phosphor by electron paramagnetic resonance

2019 ◽  
Vol 12 (05) ◽  
pp. 1950063 ◽  
Author(s):  
Wei Zeng ◽  
Yujia Wang ◽  
Lina Wang ◽  
Yali Lan ◽  
Jie Zao
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Emission Band ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Broad Emission Band ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Testing Method ◽  
Broad Emission ◽  
Luminescent Centers ◽  
Electron Paramagnetic

Trap types of the yellow emitting long-persistent phosphor Ca2BO3Cl: [Formula: see text], [Formula: see text] were analyzed in this study. [Formula: see text] acting as luminescent centers produced a broad emission band located at 580[Formula: see text]nm, which ascribes to the 5d-4f transitions. Four kinds of traps in this afterglow phosphor were detected by thermoluminescence spectra. Electron paramagnetic resonance spectroscopy, which is a considerable testing method, was used to identify the traps caused by different reasons. Based on it, detailed processes and traps analyses were examined and discussed.

scholarly journals Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 542 ◽  
Author(s):  
Weiyi Zhang ◽  
Can He ◽  
Xiaowen Wu ◽  
Ximing Huang ◽  
Fankai Lin ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Emission Band ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Color Temperature ◽  
Broad Emission Band ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Broad Emission

The fabrication and luminescent performance of novel phosphors Na2YMg2V3O12:Dy3+ were investigated by a conventional solid-state reaction method. Under near-UV light, the Na2YMg2V3O12 host self-activated and released a broad emission band (400–700 nm, with a peak at 524 nm) ascribable to charge transfer in the (VO4)3− groups. Meanwhile, the Na2YMg2V3O12:Dy3+ phosphors emitted bright yellow light within both the broad emission band of the (VO4)3- groups and the sharp peaks of the Dy3+ ions at 490, 582, and 663 nm at a quenching concentration of 0.03 mol. The emission of the as-prepared Na2YMg2V3O12:Dy3+ phosphors remained stable at high temperatures. The obtained phosphors, commercial Y2O3:Eu3+ red phosphors, and BaMgAl10O17:Eu2+ blue phosphors were packed into a white light-emitting diode (WLED) device with a near-UV chip. The designed WLED emitted bright white light with good chromaticity coordinates (0.331, 0.361), satisfactory color rendering index (80.2), and proper correlation to a color temperature (7364 K). These results indicate the potential utility of Na2YMg2V3O12:Dy3+ phosphor as a yellow-emitting phosphor in solid-state illumination.

Effect of Mechanical Milling on Photoluminescence of γ-Alumina Nanoparticles

2008 ◽  
Vol 8 (3) ◽  
pp. 1414-1416 ◽  
Author(s):  
Jinsong Luo ◽  
Shufeng Liu ◽  
Lidan Wang ◽  
Yi Fan ◽  
Ligong Zhang ◽  
...  
Keyword(s):  
Emission Band ◽  
Milling Time ◽  
Surface Defects ◽  
Broad Band ◽  
Alumina Nanoparticles ◽  
Broad Emission Band ◽  
Broad Emission ◽  
Two Peaks ◽  
Photoluminescence Behavior ◽  
Ball Milling Time

The effect of mechanical alloying on the photoluminescence behavior of γ-Al2O3 nanopowder was studied. Two emission peaks centered at 343 and 378nm and a broad emission band ranging between 400–600 nm have been observed. It is found that the intensity of the two emission peaks decreases with ball-milling time, while that the broad band remains un-change. These results suggested that the two peaks are resulted from the surface defects that analogs of F+ centers, while the broad band is resulted from impurity.

scholarly journals Towards ultra-broad emission band by luminescent film with continuously tunable emission wavelength

2014 ◽  
Vol 4 (6) ◽  
pp. 1159 ◽  
Author(s):  
Bai Xue ◽  
Bo Fan ◽  
Michel Cathelinaud ◽  
Xianping Fan ◽  
Xianghua Zhang
Keyword(s):  
Emission Band ◽  
Emission Wavelength ◽  
Broad Emission Band ◽  
Broad Emission ◽  
Tunable Emission

Ternary In2S3/In2O3 heterostructures and their cathodoluminescence

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51089-51095 ◽  
Author(s):  
Wenjin Yang ◽  
Baodan Liu ◽  
Yujin Cho ◽  
Bing Yang ◽  
Benjamin Dierre ◽  
...  
Keyword(s):  
Emission Band ◽  
Three Dimensional ◽  
Broad Emission Band ◽  
Visible Range ◽  
Broad Emission ◽  
Photocatalytic Applications

Three-dimensional In2S3/In2O3 heterostructures are obtained through a CVD process. The heterostructures have a broad emission band covering the whole visible range, which holds a promise in photocatalytic applications.

scholarly journals Fullerene Aggregation in Thin Films of Polymer Blends for Solar Cell Applications

2018 ◽  
Author(s):  
Camilla Lindqvist ◽  
Ellen Moons ◽  
Jan van Stam
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Emission Band ◽  
Fluorescence Spectra ◽  
Emission Peak ◽  
Fullerene Derivative ◽  
Broad Emission Band ◽  
Film Morphology ◽  
Broad Emission ◽  
Main Emission Peak

We report on the effects of the film morphology on the fluorescence spectra for a thin film including a quinoxaline-based co-polymer (TQ1) and a fullerene derivative (PC70BM). The ratio between the polymer and the fullerene derivative, as well as the processing solvent were varied. Beside the main emission peak at 700 nm in the fluorescence spectra of thin films of this phase-separated blend, a broad emission band is observed with a maximum at 520 - 550 nm. The intensity of this emission band decreases with an increasing degree of mixing in the film and becomes most prominent in thicker films, films with high PC70BM content, and films that were spin-coated from solvents with lower PC70BM solubility. We assign this emission band to aggregated PC70BM.

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