Luminescence Properties of Rare-Earth Doped α-SiAlONs

Rare-earth doped Ca-α-SiAlON phosphors, with the compositions of (Ca1-3/2xREx)m/2Si12-m-nAlm+nOnN16-n (RE = Ce, Sm, Eu, Tb, Yb and Dy, 0.5 ≤ m = 2n ≤ 3.0), were prepared by reaction at 1700oC for 2h under 10 atm N2. The concentration of rare earths varied from 3 to 30 at% with respect to Ca. The photoluminescence properties of the powders were investigated at room temperature. The results show that (i) strong visible emissions are observed in rare-earth doped Ca-α-SiAlONs; (ii) the emission properties can be optimized by tailoring the activator concentration and the composition of the α-SiAlON host crystal; and (iii) the yellow Eu2+-doped Ca-α-SiAlON phosphors can be used in warm white LEDs.

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ChemInform Abstract: Crystal, Electronic Structures and Photoluminescence Properties of Rare-Earth Doped LiSi2N3.

ChemInform ◽

10.1002/chin.200918010 ◽

2009 ◽

Vol 40 (18) ◽

Author(s):

Y. Q. Li ◽

N. Hirosaki ◽

R. J. Xie ◽

T. Takeka ◽

M. Mitomo

Keyword(s):

Rare Earth ◽

Electronic Structures ◽

Photoluminescence Properties ◽

Rare Earth Doped

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Luminescence characteristics of rare-earth-doped barium hexafluorogermanate BaGeF6 nanowires: fast subnanosecond decay time and high sensitivity in H2O2 detection

RSC Advances ◽

10.1039/c8ra07806h ◽

2018 ◽

Vol 8 (69) ◽

pp. 39296-39306 ◽

Cited By ~ 6

Author(s):

Gibin George ◽

Machael D. Simpson ◽

Bhoj R. Gautam ◽

Dong Fang ◽

Jinfang Peng ◽

...

Keyword(s):

Rare Earth ◽

Rare Earths ◽

Decay Time ◽

High Sensitivity ◽

H2o2 Detection ◽

Highly Sensitive ◽

Inorganic Scintillators ◽

Luminescence Characteristics ◽

Rare Earth Doped

The decay time of BaGeF6 nanowires codoped with rare earths is found in the order of subnanoseconds, being one of the shortest decay time records from inorganic scintillators. Their luminescence emissions are highly sensitive for H2O2 detection.

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The pH Value Control of Morphology and Luminescence Properties of Gd2O2S: Tb3+ Phosphors

Materials ◽

10.3390/ma15020646 ◽

2022 ◽

Vol 15 (2) ◽

pp. 646

Author(s):

Peng Jiang ◽

Zhipeng Li ◽

Wei Lu ◽

Yi Ma ◽

Wenhuai Tian

Keyword(s):

Electron Beam ◽

Rare Earth ◽

Ph Value ◽

Uv Light ◽

Hexagonal Phase ◽

Band Gap Energy ◽

Information Storage ◽

Luminescence Properties ◽

Research Fields ◽

Rare Earth Doped

Developing rare-earth doped oxysulfide phosphors with diverse morphologies has significant value in many research fields such as in displays, medical diagnosis, and information storage. All of the time, phosphors with spherical morphology have been developed in most of the related literatures. Herein, by simply adjusting the pH values of the reaction solution, Gd2O2S:Tb3+ phosphors with various morphologies (sphere-like, sheet-like, cuboid-like, flat square-like, rod-like) were synthesized. The XRD patterns showed that phosphors with all morphologies are pure hexagonal phase of Gd2O2S. The atomic resolution structural analysis by transmission electron microscopy revealed the crystal growth model of the phosphors with different morphology. With the morphological change, the band gap energy of Gd2O2S:Tb3+ crystal changed from 3.76 eV to 4.28 eV, followed by different luminescence performance. The samples with sphere-like and cuboid-like microstructures exhibit stronger cathodoluminescence intensity than commercial product by comparison. Moreover, luminescence of Gd2O2S:Tb3+ phosphors have different emission performance excited by UV light radiation and an electron beam, which when excited by UV light is biased towards yellow, and while excited by an electron beam is biased towards cyan. This finding provides a simple but effective method to achieve rare-earth doped oxysulfide phosphors with diversified and tunable luminescence properties through morphology control.

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