Preparation and Characterization of Red Luminescent Ca0.8Zn0.2TiO3: Pr3+, Na+ Nanophosphor

doi:10.1016/S1002-0721(06)60060-4

Journal of Rare Earths

Volume 24, Issue 1, February 2006, Pages 29-33

https://doi.org/10.1016/S1002-0721(06)60060-4 Get rights and content

Abstract

Nanophosphor with the nominal composition of Ca_0.8Zn_0.2TiO₃:Pr³⁺, Na⁺ (CZTOPN) was synthesized at relatively low temperature by the sol-gel method. Metal ions were dispersed by citric acid in ethylene glycol solvent and then react with Ti(OC₄H₉)₄ to form sol and gel. The decomposition process of the precursor, and crystallization and particle size of CZTOPN were examined by thermal analysis (TG-DSC), powder X-ray diffraction (XRD), and scan election microscopy (SEM). Results of TG-DSC and XRD reveal that the composition of Ca_0.8Zn_0.2TiO₃:Pr³⁺, Na⁺ changes with the sintering temperature. SEM data indicate that the diameter of particles is under 50 nm even if the sintering temperature increases to 1000 °C. In contrast to a solid state reaction, the excitation spectra of samples synthesized by the sol-gel method shift blue about 10 nm and the emission intensity at 617 nm increases significantly.

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Lian Shixun (1964-), Male, Doctoral candidate, Professor

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Cited by (11)

High temperature sensitivity phosphor based on an old material: Red emitting H<inf>3</inf>BO<inf>3</inf> flux assisted CaTiO<inf>3</inf>: Pr3+
2019, Journal of Luminescence
Citation Excerpt :
It is seen that there is a broad band with several typical peaks in the range of 200–530 nm in PLE spectrum. The shoulder peak (labeled as A) centered at ~276 nm is assigned to 4f to 5d transition of Pr3+ in most Refs. [5,25,26], but the shoulder peak A centered at ~276 nm is assigned to host absorption by Lian et al. [27]. The strong sharp peak (labeled as B) centered at ~331 nm is also attributed to absorption of host material.
High temperature sensitivity phosphor based on an old material red emitting CaTiO₃: Pr³⁺ phosphor prepared via H₃BO₃ flux assisted solid-state reaction is reported. The typical sample possesses the orthorhombic perovskite phase and no impurity is found. The optical bandgap value is ~3.59 eV. There exists a single red emission with ideal color purity. The average long-afterglow decay time is 87.7s, the average trap depth is 0.76 eV. The maximum absolute sensitivity at 473 K is equal to ~0.0258 K^-1 and the maximum relative sensitivity is estimated to be 7.69% K⁻¹ at 298 K with the resolution of 0.26–0.65 K, indicating the suitability of the material for temperature sensitivity application. A possible mechanism for the quenching of ³P_j emission at room temperature and the thermal quenching process of ¹D₂ level through intervalence charge transfer state are proposed from the configurational coordinate diagram.
Enhanced photoluminescence and ultrahigh temperature sensitivity from NaF flux assisted CaTiO<inf>3</inf>: Pr3+ red emitting phosphor
2019, Journal of Alloys and Compounds
The Pr³⁺ doped CaTiO₃ red emitting phosphor with enhanced PL and ultrahigh temperature sensing was prepared via NaF flux assisted solid-state reaction. All samples had the orthorhombic perovskite phase and no impurity was found. The typical sample mainly had sphere-like morphology with particle size of ∼670 nm. The optical bandgap values were ∼3.62–3.63eV. The Pr³⁺ quenching content was 0.6 mol% and the ET mechanism for quenching was the d-d interaction with the critical distance of 26.09 Å. A certain amount of NaF flux could enhance red emission attributed to ¹D₂→³H₄ transition owing to improving the crystallinity of phosphors and reducing point defects near Pr³⁺ through the substitution of O²⁻ by F⁻ and Ca²⁺ by Na⁺. The energy storage trap (oxygen vacancy) near IVCT state played the key role for trapping electrons, accounting for the LAG emission and the average depth of trap was 0.39 eV. The CIE chromaticity coordinates were very close to that of the ideal red light and the CP was as high as 99.98%. The maximal S_a and S_r was as high as ∼0.015 K^-1 and∼ 5.2% K⁻¹, respectively. The thermal induced relaxation between the ³P_j levels and ¹D₂ level through the IVCT state was supposed to account for the excellent optical temperature sensing. Our work may provide a useful inspiration for developing ultrahigh sensitive optical temperature sensors.
Energy transfer based photoluminescence properties of co-doped (Er3+ + Pr3+): PEO + PVP blended polymer composites for photonic applications
2016, Optical Materials
Citation Excerpt :
A weak excitation band at 418 nm may be assigned to the 4f → 4f transitions of Pr3+. This is in good agreement with the earlier reports [21,22]. Fig. 6(b) shows the emission spectrum of PEO + PVP: 0.1 wt%Pr3+ polymer film under the excitation of 378 nm.
Er³⁺, Pr³⁺ singly doped and co-doped PEO + PVP polymer composites have been synthesized by conventional solution casting method. The structural analysis has been carried out for all these polymer composites from XRD analysis. Raman spectral studies confirm the ion-polymer interactions and polymer complex formation. Thermal properties of pure polymer film has also been clearly elucidated by TG/DTA profiles. Well defined optical absorption bands pertaining to Er³⁺ and Pr³⁺ are observed in the absorption spectral profile and these bands are assigned with corresponding electronic transitions. The polymer films containing singly doped Er³⁺ and Pr³⁺ ions have displayed green and red emissions at 510 nm (²H_11/2 → ⁴I_15/2) and 688 nm (³P₀ → ³F₃) respectively under UV excitation source. Comparing the emission spectra of singly Er³⁺ and co-doped Er³⁺ + Pr³⁺: PEO + PVP polymer films, a significant red emission pertaining to Pr³⁺ions is remarkably enhanced in co-doped polymer system. This could be ascribed to possible energy transfer from Er³⁺ to Pr³⁺ in co-doped polymer system. The energy transfer mechanism is clearly demonstrated using their emission performances, overlapped spectral profiles and also life time decay dynamics. Thus, it could be suggested that Er³⁺: PEO + PVP, Pr³⁺: PEO + PVP and (Er³⁺ + Pr³⁺): PEO + PVP blended polymer films are potential materials for several photonic applications.
Effect of different dopants on the long lasting phosphorescence behavior of CaTiO<inf>3</inf>:Pr3+
2011, Journal of Rare Earths
In order to improve the luminescence properties of CaTiO₃:Pr³⁺, a series of CaTiO₃:Pr³⁺, such as CaTi_0.97Nb_0.03O₃:Pr³⁺, Ca_0.8Zn_0.2TiO₃: Pr³⁺, Ca_0.8Zn_0.2Ti_0.97Nb_0.03O₃:Pr³⁺ and B³⁺-doped Ca_0.8Zn_0.2Ti_0.97Nb_0.03O₃: Pr³⁺ were prepared through conventional solid state reaction method. The results of the photoluminescence excitation and emission spectra showed that all the samples emitted red phosphorescence at 612 nm originating from ¹D₂ to ³H₄ emission of Pr³⁺ under the 337 nm excitation. When examined by the X-ray diffraction (XRD), all the samples presented a predominant phase of CaTiO₃ (JCPDS# 42-423) except Zn²⁺-doped samples which also revealed another phase of Zn₂Ti₃O₈ (JCPDS# 73-579). The results of the afterglow decay curves showed that co-doping Zn²⁺ ions, Nb⁵⁺ ions or adding a small amount of B³⁺ into Ca_0.8Zn_0.2Ti_0.97Nb_0.03O₃:Pr³⁺ were effective in improving the photoluminescence properties of CaTiO₃:Pr³⁺ phosphor. Thermoluminescence results showed that the trap existing in all the samples was the same as in CaTiO₃:Pr³⁺ and doping singly Nb⁵⁺ or Zn²⁺ hardly changed the trap depth but co-doping Nb⁵⁺ and Zn²⁺ could modify the trapping level from 0.63 to 1.26 eV distinctively. In addition, adding a certain amount of B³⁺ into CTO-PZN could also deepen the trap depth.
Improvement of luminescence properties of Ca<inf>0.8</inf>Zn <inf>0.2</inf>TiO<inf>3</inf>:Pr3+ prepared by hydrothermal method
2013, Journal of Materials Research
Improved Luminescence Properties of Ca<inf>0.8</inf>Zn<inf>0.2</inf>TiO<inf>3</inf>:Pr3+ Phosphors Doped with Si and Lu
2018, Faguang Xuebao/Chinese Journal of Luminescence

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Lian Shixun (1964-), Male, Doctoral candidate, Professor

: Project supported by the National Natural Science Foundation of China (20371017)

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Journal of Rare Earths

Abstract

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References (14)

Synthesis of SrTiO₃: Pr, Al by ultrasonic spray pyrolysis

Ceram. Inter.

Synthesis and red luminescence of Pr³⁺-doped CaTiO₃ nanophosphor from polymer precursor

J. Solid State Chem.

Emission from BaTiO₃: Pr³⁺ control by ionic radius of added trivalent ion

J. Appl. Phys.

Enhancement of characteristic red emission from SrTiO₃: Pr³⁺ by Al addition

J. Appl. Phys.

Characteristic enhancement of emission from SrTiO₃: Pr³⁺ by addition group-III b ions

J. Appl. Phys. Lett.

Luminescent properties of praseodymium-doped alkaline earth titanates

J. Lumin.

Cited by (11)

High temperature sensitivity phosphor based on an old material: Red emitting H<inf>3</inf>BO<inf>3</inf> flux assisted CaTiO<inf>3</inf>: Pr<sup>3+</sup>

Enhanced photoluminescence and ultrahigh temperature sensitivity from NaF flux assisted CaTiO<inf>3</inf>: Pr<sup>3+</sup> red emitting phosphor

Energy transfer based photoluminescence properties of co-doped (Er<sup>3+</sup> + Pr<sup>3+</sup>): PEO + PVP blended polymer composites for photonic applications

Effect of different dopants on the long lasting phosphorescence behavior of CaTiO<inf>3</inf>:Pr<sup>3+</sup>

Improvement of luminescence properties of Ca<inf>0.8</inf>Zn <inf>0.2</inf>TiO<inf>3</inf>:Pr<sup>3+</sup> prepared by hydrothermal method

Improved Luminescence Properties of Ca<inf>0.8</inf>Zn<inf>0.2</inf>TiO<inf>3</inf>:Pr<sup>3+</sup> Phosphors Doped with Si and Lu

Preparation and Characterization of Red Luminescent Ca0.8Zn0.2TiO3: Pr3+, Na+ Nanophosphor

Abstract

Section snippets

Ceram. Inter.

J. Solid State Chem.

Emission from BaTiO3: Pr3+ control by ionic radius of added trivalent ion

J. Appl. Phys.

Enhancement of characteristic red emission from SrTiO3: Pr3+ by Al addition

J. Appl. Phys.

Characteristic enhancement of emission from SrTiO3: Pr3+ by addition group-III b ions

J. Appl. Phys. Lett.

Luminescent properties of praseodymium-doped alkaline earth titanates

J. Lumin.

Preparation and Characterization of Red Luminescent Ca_0.8Zn_0.2TiO₃: Pr³⁺, Na⁺ Nanophosphor

Emission from BaTiO₃: Pr³⁺ control by ionic radius of added trivalent ion

Enhancement of characteristic red emission from SrTiO₃: Pr³⁺ by Al addition

Characteristic enhancement of emission from SrTiO₃: Pr³⁺ by addition group-III b ions