Transparent and low surface roughness HfO2: Tb3+, Eu3+ luminescent thin films deposited by USP technique

Martínez-Merlin, I.; Guzmán‐Mendoza, J.; Garcı́a-Hipólito, M.; Sánchez-Reséndiz, V.M.; Lartundo-Rojas, L.; Fragoso, R.; Falcony, C.

doi:10.1016/j.ceramint.2015.10.045

Cited by 19 publications

(10 citation statements)

References 32 publications

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“…The average decay times calculated from these fits were 0.97, 1.23, and 0.57 ms for Tb 3+ ions, Eu 3+ ions, and HfO 2 , respectively. The average decay times for Tb 3+ and Eu 3+ ions are similar to those obtained in other investigations .…”

Section: Resultssupporting

confidence: 88%

“…Figure b exhibits the excitation spectrum of HfO 2 :Eu 3+ films, synthesized at 600 °C and monitored at 613 nm, in which a broad band centered at 262 nm is the most intense, this band is attributed to a charge transfer from the p orbitals of the O 2− ions to f orbitals of Eu 3+ ions. Also, the typical absorption bands of the Eu 3+ ions can be observed, which are located at 361, 380, 395, 414, and 466 nm, these correspond to the electronic transitions from the ground state 7 F 0 to the excited states 5 D 4 , 5 G 4 , 5 L 6 , 5 D 3 , and 5 D 4 , respectively . The dependence of the PL emission intensity of the HfO 2 :Eu 3+ films (intensities of the band centered at 613 nm) as a function of the doping concentration is shown in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…The decay curves for transitions of Tb 3+ ions and Eu 3+ ions were fitted with a double‐exponential function as

I = A + B_{1} \exp true(- t ∖ τ_{1} true) + B_{2} \exp (- t ∖ τ_{2}),

here, I is the intensity and A (background), B 1 , B 2 , and τ 1 , τ 2 are the fitting parameters. The decay curve for the transition of the host lattice (HfO 2 ) at 420 nm was fitted with a triple‐exponential function as

I = A + B_{1} \exp true(- t ∖ τ_{1} true) + B_{2} \exp (- t ∖ τ_{2}) + B_{3} \exp (- t ∖ τ_{3}),

where once again, I is the intensity and A (background), B 1 , B 2 , B 3 and τ 1 , τ 2 , τ 3 are the fitting parameters . The average decay times, τ av , were calculated using these parameters and the following equation:

τ_{a v} = true[normalΣ B_{i} {(τ_{normali})}^{2} true] ∖ true[normalΣ B_{i} (τ_{normali}) true] .

…”

Section: Resultsmentioning

confidence: 99%

“…The HfO 2 is a potential candidate to be used as a gas sensing, electrical insulator, in opto‐electronic devices and anti‐reflective optical coatings . The HfO 2 films have a relatively high refractive index (1.89); this material has high optical transmission between 80 and 90% in the visible region and a near‐infrared of the electromagnetic spectrum . In addition, its high density and high effective atomic number makes it attractive as a scintillating material and due to its large band gap ( E g = 5.68 eV) and low phonon frequency (200–650 cm −1 ), HfO 2 has been used as a host lattice for rare earth ions and transition elements in the production of luminescent materials .…”

Section: Introductionmentioning

confidence: 99%

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Tunable white light emission from hafnium oxide films co‐doped with trivalent terbium and europium ions deposited by Pyrosol technique

Guzmán-Olguín

Montes

Guzmán‐Mendoza

et al. 2017

Physica Status Solidi (a)

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In this paper, the photo and cathodoluminescent properties of HfO2 films optically activated with different atomic concentrations of Tb3+ and Eu3+ ions, deposited by the Pyrosol technique, are reported. These films were deposited at temperatures from 400 to 600 °C, using chlorides as raw materials. The surface morphologies of all deposited films were rough and dense. X‐ray diffraction analysis showed that the films deposited at 600 °C were polycrystalline exhibiting the HfO2 monoclinic phase. The tuning by the means of the excitation wavelength generates photoluminescence spectra, for co‐doped films, in several emissions from blue to yellow (including white light) due to the characteristic electronic transitions of Tb3+ (green), Eu3+(red) ions and the violet‐blue emission associated to the host lattice (HfO2). According to the chromaticity diagram, the best white light is reached for the sample S2 excited with 382 nm (x = 0.3343, y = 0.3406). The cathodoluminescence emission spectra for co‐doped films showed emissions from green to red (including yellow, orange and other intermediate emissions). The averaged quantum efficiency values of the sample labeled as S2 resulted between 47 and 78% depending on the excitation wavelength. In addition, XPS, TEM, SEM and decay times were performed to characterize these films.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 88%

“…The decay curves for transitions of Tb 3+ ions and Eu 3+ ions were fitted with a double‐exponential function as

I = A + B_{1} \exp true(- t ∖ τ_{1} true) + B_{2} \exp (- t ∖ τ_{2}),

I = A + B_{1} \exp true(- t ∖ τ_{1} true) + B_{2} \exp (- t ∖ τ_{2}) + B_{3} \exp (- t ∖ τ_{3}),

τ_{a v} = true[normalΣ B_{i} {(τ_{normali})}^{2} true] ∖ true[normalΣ B_{i} (τ_{normali}) true] .

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tunable white light emission from hafnium oxide films co‐doped with trivalent terbium and europium ions deposited by Pyrosol technique

Guzmán-Olguín

Montes

Guzmán‐Mendoza

et al. 2017

Physica Status Solidi (a)

Self Cite

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“…HfO 2 films co-doped with Tb 3+ or Eu 3+ ions using acetylacetonates as precursors, were studied [92]. The films presented transmittance values in the visible region ≅90% and surface roughness less than 3.9 nm.…”

Section: Luminescent Materialsmentioning

confidence: 99%

Spray Pyrolysis Technique; High-K Dielectric Films and Luminescent Materials: A Review

2018

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The spray pyrolysis technique has been extensively used to synthesize materials for a wide variety of applications such as micro and sub-micrometer dimension MOSFET´s for integrated circuits technology, light emitting devices for displays, and solid-state lighting, planar waveguides and other multilayer structure devices for photonics. This technique is an atmospheric pressure chemical synthesis of materials, in which a precursor solution of chemical compounds in the proper solvent is sprayed and converted into powders or films through a pyrolysis process. The most common ways to generate the aerosol for the spraying process are by pneumatic and ultrasonic systems. The synthesis parameters are usually optimized for the materials optical, structural, electric and mechanical characteristics required. There are several reviews of the research efforts in which spray pyrolysis and the processes involved have been described in detail. This review is intended to focus on research work developed with this technique in relation to high-K dielectric and luminescent materials in the form of coatings and powders as well as multiple layered structures.

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Solution-based hafnium oxide thin films as potential antireflection coating for silicon solar cells

Kanmaz

Mandong

Üzüm

2020

J Mater Sci: Mater Electron

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Transparent and low surface roughness HfO2: Tb3+, Eu3+ luminescent thin films deposited by USP technique

Cited by 19 publications

References 32 publications

Tunable white light emission from hafnium oxide films co‐doped with trivalent terbium and europium ions deposited by Pyrosol technique

Tunable white light emission from hafnium oxide films co‐doped with trivalent terbium and europium ions deposited by Pyrosol technique

Spray Pyrolysis Technique; High-K Dielectric Films and Luminescent Materials: A Review

Solution-based hafnium oxide thin films as potential antireflection coating for silicon solar cells

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