Influence of Pr doping on the thermal, structural and optical properties of novel SLS-ZnO glasses for red phosphor

Mohamed, Noorizan; Hassan, Jumiah; Матори, Хамирул Амин; Azis, Raba’ah Syahidah; Wahab, Zaidan Abdul; Ismail, Zamratul Maisarah Mohd; Baharuddin, Nur Fadilah; Rashid, Siti Syuhaida Abdul

doi:10.1016/j.rinp.2017.03.018

Cited by 15 publications

(3 citation statements)

References 49 publications

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“…It should be noted that the exothermic crystallization peak (T pc ) of both samples occurs in the range of 600-700 • C. Furthermore, in this case, we observe an increase in the T pc with the content of the active component. A similar effect has been observed in other glass systems [9,21,[32][33][34]. In the case of undoped glass 65TeO 2 -20ZnF 2 -12PbO-3Nb 2 O 5 , values of the characteristic crystallization temperatures are T c = 552.3 • C and T pc = 588.5 • C, respectively [31].…”

Section: Thermal Featuressupporting

confidence: 80%

Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses

Klimesz,

Ryba-Romanowski,

Lisiecki

2024

Molecules

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The thermal stability of oxyfluorotellurite glass systems, (65-x)TeO2-20ZnF2-12PbO-3Nb2O5-xPr2O3, doped with praseodymium was examined. The different concentrations of praseodymium oxide (x = 0.5 and 2 mol%) were applied to verify the thermal, optical and luminescence properties of the materials under study. The relatively high values of the Dietzel (ΔT) and Saad–Poulain (S or H′) thermal stability factors determined using a differential thermal analysis (DTA) indicate the good thermal stability of the glass matrix, which gradually improves with the content of the active dopant. The temperature dependence of optical spectra in the temperature range 300–675 K for the VIS–NIR region was investigated. The involved Pr3+ optical transition intensities and relaxation dynamic of the praseodymium luminescent level were determined. The ultrashort femtosecond pulses were utilized to examine a dynamic relaxation of the praseodymium luminescent levels. Although the measured emission of the Pr3+ active ions in the studied glass encompasses the quite broad spectral region, the observed luminescence may only be attributed to 3PJ excited states. As a result, the observed decrease in the experimental lifetime for the 3P0 level along with the increasing activator content was identified as an intensification of the Pr–Pr interplay and the associated self-quenching process. The maximum relative sensitivities (Sr) estimated over a relatively wide temperature range are ~0.46% K−1 (at 300 K) for FIR (I530/I497) and 0.20% K−1 (at 600 K) for FIR (I630/I497), which seems to confirm the possibility of using investigated glasses in optical temperature sensors.

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Section: Thermal Featuressupporting

confidence: 80%

Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses

Klimesz,

Ryba-Romanowski,

Lisiecki

2024

Molecules

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“…Therefore, the crystallinity of the willemite NPs will, in turn, advance with the increase in the calcination temperature. Furthermore, it is fascinating to note that the temperature at which the willemite phase was formed in [57]. Furthermore, it is also a 300°C lower than the temperature (1200°C) reported by El Ghoul et al [58] using in the sol-gel method.…”

Section: X-ray Diffraction Analysismentioning

confidence: 82%

Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

Alibe

Матори

Sidek

et al. 2018

J Therm Anal Calorim

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Willemite is an inorganic semiconductor material used for optoelectronic applications. The present study purposes a new polymer thermal treatment method involving calcination temperature to fabricate the willemite nanoparticles. The effects of polyvinylpyrrolidone (PVP) on the structural and optical properties of the material were thoroughly investigated. Thermogravimetric and its derivative confirmed the decomposition behavior of PVP. The minimum calcination temperature to decompose PVP was appraised at 740°C. The FTIR and the Raman analyses confirmed the presence of organic source before the calcination process and the formation of the crystalline structure of the willemite nanoparticles after the heat treatment. The optimum PVP concentration in this study based on the FTIR results was found to be 40 g L-1. This is the minimum concentration at which the willemite nanoparticles remained pure with homogenous distribution. X-ray diffraction analysis of the PVP samples before calcination was confirmed to be amorphous, and upon calcination between 800 and 1000°C, an a-willemite phase was obtained. The morphology and the average particle size were determined with FESEM and HR-TEM analysis. The average particle size is between 23.8 and 36.7 nm. The optical energy band was found to be increasing from 5.24 to 5.32 eV with the corresponding increase in PVP concentration from 20 to 50 g L-1. The findings in this study provides a new pathway to understand the effects of PVP concentrations on the structural and optical properties of willemite semiconductor nanoparticles as it may have key potential applications for future optoelectronic devices.

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“…This fall is attributed to the phonon density in the system that rises with the temperature, and therefore, non-radiative relaxation of the excited electron-hole pairs becomes predominant. 66 To investigate the mechanism governing the behavior of PL responses of the two samples, the inverse temperature dependence of integrated PL intensity of each band were performed. The activation energy was calculated by tting the spectra using Origin Pro8 us soware and the model determined by G. Saint-Girons et al 67 IðTÞ ¼…”

mentioning

confidence: 99%

The structure and photoluminescence of a ZnO phosphor synthesized by the sol gel method under praseodymium doping

et al. 2019

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Influence of Pr doping on the thermal, structural and optical properties of novel SLS-ZnO glasses for red phosphor

Cited by 15 publications

References 49 publications

Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses

Spectroscopic and Thermographic Qualities of Praseodymium-Doped Oxyfluorotellurite Glasses

Effects of polyvinylpyrrolidone on structural and optical properties of willemite semiconductor nanoparticles by polymer thermal treatment method

The structure and photoluminescence of a ZnO phosphor synthesized by the sol gel method under praseodymium doping

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