Microstructural and Optical study of polycrystalline manganese oxide films using Kubelka-Munk function

Jamil, H.; Dildar, I.M.; Ilyas, Usman; Hashmi, Jaweria Zartaj; Shaukat, Saima; Sarwar, Muhammad Nauman; Khaleeq-ur-Rahman, M.

doi:10.1016/j.tsf.2021.138796

Cited by 31 publications

(9 citation statements)

References 19 publications

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“…The students should draw the UV–vis absorption coefficient spectra of KDP and SCP crystals via the origin program, and then, the absorption edge can be obtained immediately. Besides, the experimental bandgap ( E g ) can also be estimated by plotting the (α hv ) n – E curve, which can be obtained by the conversion of the fundamental absorption data. , A demonstration is given in the SI.…”

Section: Resultsmentioning

confidence: 99%

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The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education

et al. 2023

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Crystal materials are an important pillar of advanced technology. Among them, the preparation of large-sized single crystal materials is of great importance for their practical application. Herein, we select the well-known nonlinear optical crystal KH 2 PO 4 and impressive deep-blue colored crystal CuSO 4 •5H 2 O to design an integrated experiment on the growth of large-size single crystals. This experiment, which aims to introduce the basic concepts and techniques of crystal growth and characterization, was designed for undergraduate majors in chemistry and materials science. To deepen the understanding of the complicated theoretical knowledge and cultivate their interests in crystal growth, students prepared large-scaled crystals and then characterized and investigated the structures, morphologies, and properties of KH 2 PO 4 and CuSO 4 •5H 2 O. The common analytical methods involved in this lab course will help students to enhance their practical ability and thinking ability as well as initially cultivate their scientific research thoughts in the crystal material field.

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Section: Resultsmentioning

confidence: 99%

“…Besides, the experimental bandgap (E g ) can also be estimated by plotting the (αhv) n −E curve, which can be obtained by the conversion of the fundamental absorption data. 31,32 A demonstration is given in the SI.…”

Section: Uv−vis Spectroscopymentioning

confidence: 99%

The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education

et al. 2023

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“…→ 5d electronic transitions of Tb 3+ ions 69 . The Kubelka–Munk (K–M) function was utilized to determine energy band-gap (E g ) values of the prepared NPs, as described in the previous literature 70 . The E g plots of the LZO:Tb 3+ (1–9 mol %) NPs and fluxes assisted LZOT NPs were depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Lavanya

Darshan

Malleshappa

et al. 2022

Sci Rep

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Engineering a single material with multidirectional applications is crucial for improving productivity, low cost, flexibility, least power consumption, etc. To achieve these requirements, novel design structures and high-performance materials are in urgent need. Lanthanide-doped nanophosphors have the greatest strengths and ability in order to tune their applications in various dimensions. However, applications of nanophosphor in latent fingerprints visualization, anti-counterfeiting, and luminescent gels/films are still in their infancy. This study demonstrated a simple strategy to enhance the luminescence of Tb3+ (1–11 mol %) doped La2Zr2O7 nanophosphors by conjugating various fluxes via a simple solution combustion route. The photoluminescence emission spectra reveal intense peaks at ~ 491, 546, 587, and 622 nm, which arises from 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions, respectively. The highest emission intensity was achieved in the NH4Cl flux assisted nanophosphor as compared to NaBr and NH4F assisted samples. The colorimetric images of fingerprints visualized using the optimized nanophosphor on forensic related surfaces exhibit level –III ridge details, including sweat pores, the width of the ridges, bifurcation angle, and the successive distance between sweat pores, etc. These results are decisive parameters that clearly support the statement “no two persons have ever been found to have the same fingerprints”. The anti-counterfeiting security ink was formulated using optimized nanophosphor and various patterns were designed by simple screen printing and dip pen technologies. The encoded information was decrypted only under ultraviolet 254 nm light. All the designed patterns are exhibit not just what it looks/feel like and how better it works. As a synergetic contribution of enhanced luminescence of the prepared nanophosphor, the green-emissive films were fabricated, which display excellent flexibility, uniformity, and transparency in the normal and ultraviolet 254 nm light illumination. The aforementioned results revealed that the prepared NH4Cl flux-assisted La2Zr2O7: Tb3+(7 mol %) NPs are considered to be the best candidate for multi-dimensional applications.

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“…Figure 1 shows the diffuse reflectance spectra ( ) of fluorescein CT-complex. The Kubelka-Munk model (K-M) is used to convert the diffuse reflectance spectra of the fluorescein CT-complex into absorption spectra [23][24][25][26][27][28][29].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 shows the electronic absorption spectra of fluorescein CT complexes in methanol. The molar absorptivity (εmolar) of the fluorescein CT-complexes can be used to estimate the oscillator strengths (f) and the electric dipole strength (q 2 ) from the following relations [29][30][31][32][33]:…”

Section: Resultsmentioning

confidence: 99%

Preparation, spectroscopic, cyclic voltammetry and DFT/TD-DFT studies on fluorescein charge transfer complex for photonic applications

Alkathiri¹,

Atta²,

Refat³

et al. 2022

Bull. Chem. Soc. Eth.

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ABSTRACT. The solid charge transfer (CT) complexes of fluorescein (Flu) with definite acceptors (tetrafluoro para benzoquinone (Fla); 7,7,8,8-tetracyanoquinodimethane (TCNQ); 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) and iodine) were prepared. Several characteristic analytic procedures such as transmission (FT-IR), diffuse reflectance, UV-Vis absorption, and cyclic voltammetry were used to determine the structural and optical properties of the prepared fluorescein charge transfer complex. Kubelka Munk model (K-M) and the absorption spectral fitting (ASF) methods were used to obtain the optical transitions of the solid fluorescein charge transfer complex and fluorescein CT complexes in methanol solution. The cyclic voltammetry method has been presented as capable of obtaining valuable information on quasi-reversible redox systems in the fluorescein CT-complexes. The electrochemical gap of the fluorescein CT complex was successfully determined from the cyclic voltammetry technique. Theoretical calculations (density functional theory) were made to corroborate experimental results for the synthesized CT complexes. KEY WORDS: Fluorescein charge transfer complex, Optical spectroscopy, Cyclic voltammetry Bull. Chem. Soc. Ethiop. 2023, 37(2), 515-532. DOI: https://dx.doi.org/10.4314/bcse.v37i2.19

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Microstructural and Optical study of polycrystalline manganese oxide films using Kubelka-Munk function

Cited by 31 publications

References 19 publications

The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education

The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Preparation, spectroscopic, cyclic voltammetry and DFT/TD-DFT studies on fluorescein charge transfer complex for photonic applications

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Microstructural and Optical study of polycrystalline manganese oxide films using Kubelka-Munk function

Cited by 31 publications

References 19 publications

The Growth and Characterization of KH2PO4 and CuSO4·5H2O Crystals with Large Sizes for Undergraduate Education

The Growth and Characterization of KH2PO4 and CuSO4·5H2O Crystals with Large Sizes for Undergraduate Education

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Preparation, spectroscopic, cyclic voltammetry and DFT/TD-DFT studies on fluorescein charge transfer complex for photonic applications

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The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education

The Growth and Characterization of KH₂PO₄ and CuSO₄·5H₂O Crystals with Large Sizes for Undergraduate Education