Long-lasting phosphorescence in Mn2+:Zn2GeO4crystallites precipitated in transparent GeO2–B2O3–ZnO glass-ceramics

Qiu, Jianbei; Igarashi, Hajime; Makishima, Akio

doi:10.1016/j.stam.2004.12.002

Cited by 32 publications

(22 citation statements)

References 12 publications

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“…All glass and GC samples present a broad red emission band from 500 to 780 nm centering at 610 nm, which can be assigned to spin‐forbidden 4 T 1g (G)→ 6 A 1g (S) transition of Mn 2+ (d 5 ) located in the octahedral coordination site of the glass host . We note that the Mn 2+ ions are located in the tetrahedral site in the precipitated crystals, but obviously, the related emission is not dominating here . All the GC samples‐heat treated at 790°C for 1 h maintain the red emission with a slight redshift accompanied by increasing the Mn 2+ concentration (inset in Figure B).…”

Section: Resultsmentioning

confidence: 82%

Surface crystallized Mn‐doped glass‐ceramics for tunable luminescence

2019

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Monolithic luminescent glass‐ceramic is highly desirable for solid‐state lighting as it is stable and robust, while in practical light‐emitting devices only a thin luminescent layer is used for more efficient excitation and light extraction. In this paper, Mn2+‐doped glass and glass‐ceramic with the composition of 60SiO2‐8Na2O–20ZnO–12Ga2O3 were fabricated by the conventional melt‐quenching technique. We observe that the crystallization of α‐Zn2SiO4 nanocrystals takes place on the glass surface with controllable thickness after heat treatment. The glass samples show typical red emission peaking at λ = 620 nm that can be ascribed to the spin‐forbidden 4T1g(G) → 6A1g(S) transition of Mn2+ (d5) located in the octahedral coordination site of the glass host. After surface crystallization this red emission is retained and a new green emission at 528 nm is observed through the control of the crystallization temperature and duration, thus offering tunable emission characteristics promising for the lighting application. This change in the visible emission is interpreted in terms of the change of coordination state of Mn2+ from octahedral in a glass matrix to tetrahedral in the surface precipitated α‐Zn2SiO4 crystals.

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Section: Resultsmentioning

confidence: 82%

Surface crystallized Mn‐doped glass‐ceramics for tunable luminescence

2019

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“…Indeed, the emission peak shift with the heat-treatment was accompanied by the precipitation of crystalline Zn 2 SiO 4 phase, and the greenemission at 525 nm was consistent with the many previous studies in Zn 2 SiO 4 :Mn 2 phosphor. 11 ,12 Furthermore, Qiu et al 13 reported the change in luminescence wavelength from 590 nm to 535 nm in the Mn-doped GeO 2 -B 2 O 3 -ZnO system glasses and their crystallized glass-ceramics containing the Zn 2 GeO 4 crystals by means of the heat-treatment process. Thus, the Zn 2 SiO 4 :Mn 2 phosphor with green-emission was considered to precipitate through the phase-separation and crystallization process in Mn-doped ZnO-SiO 2 glasses.…”

Section: Resultsmentioning

confidence: 99%

Luminescence Property and Phase-Separation Texture of Phase-Separated Glasses and Glass-Ceramics in Mn-Doped ZnO-SiO2 System

Ohgaki

Nagumo

Soga

et al. 2007

J. Ceram. Soc. Japan

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“…As proposed by Qiu et al, this emission could correspond to six-fold coordinated Mn 2+ ions. [ 51 ] In the glass-ceramic, the red emission is shifted towards higher wavelengths at 650 nm and should result, according to the Tanabe-Sugano diagram, in a change of the crystal fi eld strength in the remaining glass matrix. The green emission observed between 500 and 550 nm is characteristic of Mn 2+ located in the tetrahedral site of the ZnGa 2 O 4 crystalline phase ( 4 T 1 → 6 A 1 transition).…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Tuneable Nanostructuring of Highly Transparent Zinc Gallogermanate Glasses and Glass‐Ceramics

Chenu

Véron

Genevois

et al. 2014

Advanced Optical Materials

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routes [ 9,10 ] have been recently reported. Technical challenges remain to produce these transparent ceramic materials (complicated and time-consuming procedures to avoid porosity, [ 11 ] limited compositions, segregation of doping agents, etc.). Many of these obstacles can be avoided via the use of glass-ceramic technology. [ 12 ] Therefore, the development of transparent glassceramics is of great interest for many promising optical applications [ 13 ] (solar concentrators, [ 14 ] optical memory media, [ 15 ] telescope mirrors, [ 16 ] amplifi ers, [ 17 ] electrooptical devices [ 18 ] ). Unlike single crystals and polycrystalline sintered ceramics, glass-ceramic materials offer considerable advantages such as a wider range of accessible chemical compositions, fabrication of complex shapes, and largescale production by fast and cost-effi cient glass-forming processes. The absence of porosity, control of the microstructure, and high transparency allow a large variety of optical glass-ceramics to be designed and commercialized.Glass-ceramic technology is generally based on the controlled crystallization of glass. [ 12 ] According to the Rayleigh-GansDebye [ 19 ] and Hendy theories, [ 20 ] the retention of transparency during glass crystallization typically requires a homogeneous distribution of nanoscale crystals in the glass-ceramic material to minimize light scattering. Nucleating agents (such as ZrO 2 and TiO 2 ) are thus often added in the parent glass to produce, by heat treatment, uniformly dispersed nanocrystals. [ 21 ] Nevertheless, a few exceptions with large crystal sizes (β-quartz- [ 16 ] and Na 2 O-CaO-SiO 2 -based glass-ceramics [ 22 ] ) have been reported, and their transparency is directly linked to a very small refractive index difference between the amorphous and crystalline phases. Much attention has been devoted to transparent silicate glass-ceramics, which often present low thermal expansion, thermal stability, and high transparency in both visible and near-infrared ranges. [ 12,16 ] However, silicatebased glass-ceramics present a high phonon energy, which considerably limits their transparency in the infrared range and therefore their applications in this domain. The development of oxyfl uoride [23][24][25][26] and chalcogenide [ 27,28 ] glass-ceramics has extended the transparency toward the infrared range. These materials offer a real alternative allowing access to applications in telecommunications [ 25,26,29 ] (up-conversion devices, waveguide amplifi ers), although their poor chemical durability and complex fabrication (synthesis under a controlled New nanostructured gallogermanate-based glass materials exhibiting high transparency in the visible and infrared regions are fabricated by conventional melt-quenching. These materials can accommodate wide oxide compositions and present nanoscale phase separation, in the form of droplets well separated from the germanate matrix. The size of the nanostructures can be tailored depending on the composition. A single heat treatment then allows select...

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Long-lasting phosphorescence in Mn²⁺:Zn₂GeO₄crystallites precipitated in transparent GeO₂–B₂O₃–ZnO glass-ceramics

Cited by 32 publications

References 12 publications

Surface crystallized Mn‐doped glass‐ceramics for tunable luminescence

Surface crystallized Mn‐doped glass‐ceramics for tunable luminescence

Luminescence Property and Phase-Separation Texture of Phase-Separated Glasses and Glass-Ceramics in Mn-Doped ZnO-SiO2 System

Tuneable Nanostructuring of Highly Transparent Zinc Gallogermanate Glasses and Glass‐Ceramics

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