Luminescence and EPR Studies of Gd3+-Activated Strong UV-Emitting CaZrO3 Phosphors Prepared via Solution Combustion Method

Singh, Vijay; Sivaramaiah, G.; Rao, J.L.; Kim, S. H.

doi:10.1007/s11664-014-3091-8

Cited by 28 publications

(7 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 I J transitions). [2,3] A relatively weak and broad emission band is observed towards the visible region for the GdCu0.2-0.6 glasses. This is likely due to luminescence from traces of monovalent copper (e.g.…”

Section: Introductionmentioning

confidence: 95%

“…[1][2][3] Hence, approaches to maximize the efficiency of UV-type B light (280-320 nm) emission, which is suitable for such applications, are currently under investigation. For instance, co-doping with a sensitizer, [2,4] variation of host band structure, [4] and control over the atmosphere during the synthesis of the materials [5] have been considered as important parameters.…”

Section: Introductionmentioning

confidence: 99%

“…6 I J transitions around 275 nm). [2,3] Thus, an energy match between these two transitions could potentially lead to a Gd 3 + !Cu 2 + electronic excitation transfer, which could reduce emission from the 6 P 7/2 metastable state in Gd 3 + . Furthermore, it may be postulated that if a two-photon quantumcutting process [6,15] takes place from the 6 P 7/2 state, which emits at around 310 nm, energies that are relevant to Cu 2 + absorption in the visible region (d-d transitions) could be reached, and the resonance condition could be fulfilled.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

Jiménez

2015

ChemPhysChem

View full text Add to dashboard Cite

The first investigation into the ultraviolet (UV) photoluminescence of gadolinium(III) in the presence of copper(II) is reported. A melt-quenched barium phosphate glass was used as a model matrix. The optical spectroscopy assessment shows that with increasing CuO concentration the Cu(2+) absorption band grows steadily, whereas the UV emission from Gd(3+) ions is progressively quenched. The data, thus, suggests the existence of a Gd(3+) →Cu(2+) energy-transfer process ocurring through quantum cutting. A downconversion/cross-relaxation pathway proceeding through a virtual state in Gd(3+) is proposed. These findings suggest gadolinium(III) could potentially be used in the optical sensing of copper(II).

show abstract

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

Jiménez

2015

ChemPhysChem

View full text Add to dashboard Cite

show abstract

“…The synthesis of novel gadolinium(III)-activated inorganic compounds and glasses is currently of interest for producing efficient sources of ultraviolet (UV) light for phototherapy lamps valuable in the treatment of skin diseases. − Hence, innovative approaches are currently sought for enhancing the UV type B (UVB) emission (280–320 nm) of Gd 3+ ions suitable for the biomedical applications. , For instance, codoping of phosphors with Pr 3+ or Pb 2+ has been reported to improve the UVB emission intensity of Gd 3+ . , In glasses, the use of codopants such as Ag + and matrix modification, e.g., by Al 2 O 3 addition, has been also indicated to boost the UV emission stemming from the 6 P 7/2 state in Gd 3+ .…”

Section: Introductionmentioning

confidence: 99%

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Jiménez

2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The silicon route to improve the ultraviolet (UV) transparency in phosphate glasses is investigated and further exploited to enhance the UV type B (280-320 nm) emission of gadolinium(III) relevant for biomedical applications. The glasses were synthesized with a barium phosphate composition by melt-quenching in ambient atmosphere and the optical properties investigated by optical absorption and photoluminescence (PL) spectroscopy including emission decay kinetics. An improvement in the UV transparency was gradually developed for the glasses melted merely with increasing amounts of Si powder. A particular PL in the visible was also exhibited for such glasses under excitation at 275 nm, consistent with the presence of Si-induced defects. For Si-Gd codoped glasses, the UV transparency was likewise manifested, while the UV emission from Gd around 312 nm was enhanced with the increase in Si concentration (up to ∼6.7 times). Moreover, along with the Gd PL intensity enhancement, a linear correlation was revealed between the increase in decay times for the GdP-emitting state and the amount of silicon. It is then suggested that the improved PL properties of gadolinium(III) originate from the increased UV transparency of the host and the consequent precluding of a nonradiative energy transfer from Gd to the matrix. Accordingly, a role of Si as PL quenching inhibitor is supported. The demonstrated efficacy of the Si-Gd codoping concept realized by a facile glass synthesis procedure may appeal to the application of the UV-emitting glasses for phototherapy lamps.

show abstract

“…UVC radiation is completely scattered and absorbed by O 3 , O 2 , and N 2 in the atmosphere [11]. In recent years, UVB has been extensively used in a variety of applications such as production of vitamin D, transcription of repair enzymes, etc [12,13].…”

Section: Introductionmentioning

confidence: 99%

Time Resolved Emission Spectra And Electron Paramagnetic Resonance Studies Of Gd3+ Doped Calcium Phosphate Glasses

Hussain¹

2016

Adv. Mater. Lett.

View full text Add to dashboard Cite

Gadolinium, Gd 3+ (4f 7), containing glasses are particularly interesting owing to their magnetic and optical properties. Gd 3+ has an electron paramagnetic resonance (EPR) centre, which is often used as the EPR probe in different matrices. Another important feature of Gd 3+ is that emits ultraviolet radiation (UVR) at around 310-313 nm from the 6 P 7/2  8 S 7/2 transition and is suitable for the treatment of skin disease. Here, we report on Gd 3+ doped calcium phosphate host glasses with four different concentrations; 0.5-4 mol % and labelled as 0.5Gd, 1Gd, 2Gd and 4Gd. A strong emission peak at 310 nm was observed in the reported glasses with excitation at 274 nm. The emission spectra can also be obtained at specific times during the decay. The time resolved emission data was analyzed with three different approaches namely, simple exponential, NED distribution and stretched exponential. The other approaches confirm the single exponential behaviour for all samples with deviation for the 0.5 Gd. The decay associated spectra (DAS) for the 0.5 Gd indicate that both decays have the same origin. The EPR spectrum exhibits several resonance signals characteristic of Gd 3+ ions. The stimulated emission cross sections (σ P E ×10 −21 cm 2) of the UV emission transition 6 P 7/2  8 S 7/2 were also reported in the above three approaches.

show abstract

Luminescence and EPR Studies of Gd3+-Activated Strong UV-Emitting CaZrO3 Phosphors Prepared via Solution Combustion Method

Cited by 28 publications

References 66 publications

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺

Time Resolved Emission Spectra And Electron Paramagnetic Resonance Studies Of Gd3+ Doped Calcium Phosphate Glasses

Contact Info

Product

Resources

About

Luminescence and EPR Studies of Gd3+-Activated Strong UV-Emitting CaZrO3 Phosphors Prepared via Solution Combustion Method

Cited by 28 publications

References 66 publications

UV Emission of Gd3+ in the Presence of Cu2+: Towards Luminescence Quenching through Quantum Cutting?

UV Emission of Gd3+ in the Presence of Cu2+: Towards Luminescence Quenching through Quantum Cutting?

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd3+

Time Resolved Emission Spectra And Electron Paramagnetic Resonance Studies Of Gd3+ Doped Calcium Phosphate Glasses

Contact Info

Product

Resources

About

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

UV Emission of Gd³⁺ in the Presence of Cu²⁺: Towards Luminescence Quenching through Quantum Cutting?

Silicon-Induced UV Transparency in Phosphate Glasses and Its Application to the Enhancement of the UV Type B Emission of Gd³⁺