Fluorescence properties of SrAl12O19 : Pr3+quantum cutting phosphor

Ikeda, Yuji; Masada, K; Kurokawa, Hisayoshi; Motomura, Hideki; Jinno, Masafumi; Tachibana, Kunihide

doi:10.1088/0022-3727/46/6/065305

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…These materials are gaining popularity as promising luminescent materials for the use in fluorescence lamps, luminous paints for airports and highways, buildings, cathode ray tubes, plasma display, ceramic products, textile threads, night time safety displays, clocks, way‐finding systems, etc . In recent years, different phases of rare‐earth‐doped strontium aluminates such as Sr 2 Al 6 O 11 :Eu 2+ , Sr 3 Al 2 O 6 :Eu 3+ , Sr 4 Al 14 O 25 :Eu 2+ , Sr 5 Al 2 O 8 :Eu 3+ , SrAl 2 O 4 :Eu 2+ , SrAl 12 O 19 :Pr 3+ , SrAl 12 O 19 :Ce 3+ , Sr 4 Al 14 O 25 :Sm 2+ were developed . The emission wavelength of the visible light depends on the crystalline structure of the strontium aluminate phases, e.g., SrAl 2 O 4 :Eu 2+ ,Dy 3+ and Sr 4 Al 14 O 25 :Eu 2+ ,Dy 3+ , shows the wavelength of 520 and 480 nm, respectively .…”

Section: Introduction To Luminescent Materialsmentioning

confidence: 99%

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

et al. 2014

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The discovery of rare earth based phosphors in 1960s started a new era of luminescence. In comparison with sulfide-based phosphors, strontium aluminates received worldwide acceptance because of their chemical stability and good luminescent properties. The SrAl x O y :Eu 2+ ,Dy 3+ phosphors excited by UV or visible light emit phosphorescence in the blue-green region after the excitation source has been removed, and the phosphorescence last for more than 15 h. The major disadvantage of SrAl x O y :Eu 2+ ,Dy 3+ phosphors is that they are prone to hydrolysis and their luminescent properties gradually deteriorate. The dispersion of these phosphors in a waterproof polymer matrix is an alternative method reported for retaining their luminescent properties. The review extensively deals with strontium aluminate based luminescent materials, the mechanism of luminescence, their synthesis techniques, and different mixing procedures to prepare polymer/strontium aluminate composites. Different methods to improve the dispersion of the strontium aluminate in the polymer matrix are also outlined. C

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Section: Introduction To Luminescent Materialsmentioning

confidence: 99%

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

et al. 2014

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“…In recent decades the search for new luminescence, phosphor and scintillation materials intensified due to the increased number of their applications such as mercury-free tube [1][2][3] and light emitting diode (LED) based lighting systems [4,5], plasma display panels [6], up-and down-conversion materials for solar cells [7,8], medical imaging and therapies [9][10][11], detectors for VUV photon beams and microimaging [12], fast scintillators and x-ray phosphors [13], homeland security techniques [14] and tunable solid state UV or VUV lasers [15,16]. The instrumentation and experimental methods have been evolved significantly as well [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Luminescent materials: probing the excited state of emission centers by spectroscopic methods

Mihóková¹,

Nikl²

2014

Meas. Sci. Technol.

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We review recent methods employed to study the excited state of rare-earth centers in various luminescent and scintillating materials. The focus is on processes that help determine localization of the excited state within the material band gap, namely photoionization and thermally stimulated ionization. Then the tunneling process between the luminescence center and the trapping state is addressed. We describe the experimental implementation of methods recently developed to study these processes. We report theoretical models helping the data interpretation. We also present application to currently investigated materials.

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“…Similarly, SrAl 12 O 19 doped with Eu 2+ has shown 90% quantum efficiency for blue emission and while codoped with Cr 3+ showed energy transfer from Eu 2+ to Cr 3+ . Because of the variety of cation sites present, SrAl 12 O 19 has been identified as an active material for white light‐emitting diodes . The excellent properties of SrAl 12 O 19 , such as high quantum efficiency and good stability, are attributed to the peculiar structure of the material permitting it to accommodate large rare earth ions in the 12‐fold coordination sites of Sr as well as transition‐metal ions at the different Al 3+ sites aside from its large band gap …”

Section: Introductionmentioning

confidence: 99%

Identification of the Zn Substitution Sites in La–Zn Substituted SrAl₁₂O₁₉ from ²⁷Al Solid‐State NMR Studies

et al. 2014

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The La–Zn substituted hexagonal strontium aluminate, Sr1−xLaxAl12−xZnxO19, with the magnetoplumbite structure and having five different coordination environments for Al with different symmetries, is investigated using 27Al solid‐state NMR to get detailed information on the sites of substitution of Zn and the associated changes in the local coordination environments of Al. The objective of the study was to get information on the local structural variations in the isostructural La–Co substituted strontium ferrite, Sr1−xLaxFe12−xCoxO19, showing enhanced magnetic performance on substitution. The NMR studies on the aluminate give direct evidence for the sites of substitution and the changes in the local coordination environments. It is found that Zn is substituted at the 2a and 4f2 AlO6 octahedral sites. However, an interesting observation from the NMR studies is the stabilization of the Al site occupancy at the penta‐coordinated 2b site over the distorted tetrahedral 4eAl site, without any substitution at these sites. Large changes in the quadrupolar coupling constant of the 2a and 4e sites are observed between x = 0.2 and 0.3, corresponding to the compositional region showing higher performance in the case of Sr1−xLaxFe12−xCoxO19, indicating the role of distortion of local coordination environments on suitable substitution in controlling the performance parameters.

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Fluorescence properties of SrAl₁₂O₁₉ : Pr³⁺quantum cutting phosphor

Cited by 8 publications

References 13 publications

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Luminescent materials: probing the excited state of emission centers by spectroscopic methods

Identification of the Zn Substitution Sites in La–Zn Substituted SrAl₁₂O₁₉ from ²⁷Al Solid‐State NMR Studies

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Fluorescence properties of SrAl12O19 : Pr3+quantum cutting phosphor

Cited by 8 publications

References 13 publications

Developments in Eu+2‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Developments in Eu+2‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Luminescent materials: probing the excited state of emission centers by spectroscopic methods

Identification of the Zn Substitution Sites in La–Zn Substituted SrAl12O19 from 27Al Solid‐State NMR Studies

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Product

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Fluorescence properties of SrAl₁₂O₁₉ : Pr³⁺quantum cutting phosphor

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Identification of the Zn Substitution Sites in La–Zn Substituted SrAl₁₂O₁₉ from ²⁷Al Solid‐State NMR Studies