Spectral studies of Dy3+:zincphosphate glasses for white light source emission applications: A comparative study

Chandrappa, V.; Basavapoornima, Ch.; Kesavulu, C.R.; Babu, A. Mohan; Depuru, Shobha Rani; Jayasankar, C.K.

doi:10.1016/j.jnoncrysol.2022.121466

Cited by 103 publications

(35 citation statements)

References 99 publications

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“…Furthermore, the Y/B ratio values for all Dy +3 doped glasses is greater than unity, indicating a higher degree of covalence between Dy +3 and oxygen ions and a lower degree of symmetry around rare‐earth ion sites. [ 3 ] There is no significant shift in the position of emission bands with the increase in Dy +3 content. But luminescent intensity increases with the increase in Dy +3 content from 0.5–1.5 (mol%) and then a decline in intensity from 2 to 2.5 (mol%) is evident.…”

Section: Resultsmentioning

confidence: 99%

“…Similar trend of CIE chromaticity coordinates has been reported in the literature. [ 3,6,8,67 ] The quality of white light emission can be assessed by correlated color temperature (CCT) using conventional McCamy's approximate formula. [ 68 ]

CCT = - 449 n^{3} + 3525 n^{2} - 6823 n + 5520.33

where n = ( x − x e )/( y − y e ) is the inverse slope line and ( x e = 0.332, y e = 0.186) is the epicentre.…”

Section: Resultsmentioning

confidence: 99%

“…Especially, advancement in the white-lightemitting diodes (WLEDs) technology is the key objective of researchers owing to its high efficiency, low power consumption, etc. [1][2][3][4][5][6][7][8] Nowadays, due to advancements in fabrication techniques to produce materials with desired optical transparency, density, and thermal stability, noncrystalline materials have also drawn the interest of researchers toward radiation shielding. Due to various limitations such as opaqueness, crack prone nature of conventional radiation shields made of high-density concrete and lead (Pb), such materials need to be replaced.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Sharma

Verma

Kaur

2023

Physica Status Solidi (a)

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A series of quaternary tellurite‐based glasses (72−x)TeO2 + 25B2O3 + 3K2CO3 + xDy2O3, where (x = 0, 0.5, 1, 1.5, 2, 2.5), are prepared using melt quenching technique. The effect of dopants on structural, physical, optical, and thermal properties of alkali boro‐tellurite glasses are studied using the differential thermal analysis (DTA) technique, UV–vis spectrometer, and photoluminescence technique. The density of as‐prepared samples has been obtained using the conventional Archimedes principle and other physical parameters, viz. molar volume and ion concentration, are also calculated using density. The optical absorption spectra exhibits different excited states of Dy3+ corresponding to 6H15/2→ 6F5/2(∼805 nm), 6F3/2(∼755 nm), 4F9/2 (∼473 nm), 4I15/2 (∼454 nm), 4G11/2 (∼427 nm), 4F7/2(389 nm), 4P3/2(∼366 nm). With the increase in Dy+3 concentration, an increase in optical bandgap, density, and molar volume as well as decrease in molar reflectivity, and reflection loss is evident from this study. The effect of Dy+3 ion concentration on Y/B intensity ratios and CIE chromaticity coordinates have been evaluated to understand the possible applications of aforementioned glass samples for white‐light‐emitting diodes (WLEDs). Moreover, various shielding parameters, viz. half value layer (HVL), mean free path (MFP), effective atomic number (Z eff), mass attenuation coefficient (MAC) have also been determined to understand the shielding characteristics of as‐prepared glass samples.

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Section: Resultsmentioning

confidence: 99%

CCT = - 449 n^{3} + 3525 n^{2} - 6823 n + 5520.33

where n = ( x − x e )/( y − y e ) is the inverse slope line and ( x e = 0.332, y e = 0.186) is the epicentre.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Sharma

Verma

Kaur

2023

Physica Status Solidi (a)

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“…Compared to the chromaticity coordinate of LNKBASDy 1.0 (0.4037, 0.4065), the addition of sensitizers makes the chromaticity coordinate of the tri‐doped glasses close to standard white light (0.333, 0.333). It shows that the addition of sensitizers enhances the broadband emission in the blue region, which decreases the yellow‐to‐blue ratio (Y/B) of Dy 3+ and makes the chromaticity coordinate close to the standard white light 51–53 …”

Section: Resultsmentioning

confidence: 99%

“…It shows that the addition of sensitizers enhances the broadband emission in the blue region, which decreases the yellow-to-blue ratio (Y/B) of Dy 3+ and makes the chromaticity coordinate close to the standard white light. [51][52][53] Figure 11C shows the comparison of the excitation spectra of Sb 3+ -Ce 3+ -Dy 3+ tri-doped and Dy 3+ single-doped LNKBAS glasses monitored at 579 nm, where the excitation range of Dy 3+ covers the entire UV range, and the spectral enhancement occur mainly in the UVB as shown in the inset. Moreover, it can be visualized that the Sb 3+ -doped concentration determines the sensitization F I G U R E 1 2 CIE (x, y) chromaticity diagram of the LNKBAS glasses effect of Dy 3+ at the UVC, whereas the Ce 3+ -doped concentration dominates at the UVB.…”

Section: 4mentioning

confidence: 99%

Excitation expansion in the high‐energy UV region for Dy³⁺‐doped medium‐temperature molten silicate glass phosphors

Tian

et al. 2022

J Am Ceram Soc.

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Medium‐temperature molten Dy3+‐doped silicate (LNKBAS) glass phosphors can be excited efficiently in the low‐energy ultraviolet region (UVA). To this end, the addition of sensitizers Sb3+ and Ce3+ expands the validly excitable wavelength of Dy3+ from 348 to 248 nm. Fluorescence spectra demonstrate the superposition effect of the sensitization in the high‐energy ultraviolet region (UVC), and the multiplicative effect of sensitization in the UVA and medium‐energy ultraviolet region (UVB) for Sb3+–Ce3+–Dy3+ tri‐doped LNKBAS glass phosphors. The chromaticity coordinate of LNKBASCe0.04Sb0.1Dy1.0 is (0.2725, 0.3031) at 248 nm excitation, and the sensitization coefficient of LNKBASCe0.04Sb0.2Dy1.0 reaches at 19.85 under 309 nm excitation. Static fluorescence photographs and dynamic fluorescence video reveal the excitation expansion and the multiplicative effect of sensitization to Dy3+ by adding sensitizers at a macroscopic level. In general, the ideal rare‐earth energy conversion in medium‐temperature molten silicate glass phosphors offers promising prospects for saving energy and manufacturing high‐quality optoelectronic devices.

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Orange‐red luminescence of samarium‐doped bismuth–germanium–borate glass for light‐emitting devices

Netheti¹,

Ravanamma²,

Ravi³

et al. 2023

Luminescence

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Samarium (Sm3+)‐doped glass has sparked a rising interest in demonstrating a noticeable emission in the range of 400–700, which is advantageous in solid‐state lasers in the visible region, colour displays, undersea communication, and optical memory devices. This study reports the fabrication of Sm3+‐doped bismuth–germanium–borate glasses were established using a standard melt‐quenching technique and inspection by absorption, steady‐state luminescence, and transient studies. The typical peaks of Sm3+ ions were detected in the visible range under 403 nm excitation. A strong emission band was detected at 599 nm that resembles the 4G5/2→6H7/2 transition of Sm3+ ions for BGBiNYSm0.5 glass. Furthermore, a reddish‐orange (coral) luminescence at 646 nm that resembles the 4G5/2→6H9/2 transition was also perceived. The stimulated emission cross‐section of 4G5/2 level for BGBiNYSm0.5 glass was 0.39 × 10−22 cm2. Lifetime of the 4G5/2 level was enhanced for the BGBiNYSm0.5 glass and decreased with an increase in active ion concentrations. The lifetime quenching of ions at the metastable state was because of energy transfer among Sm3+ ions by cross‐relaxation channels. Commission Internationale de l'Éclairage (CIE) coordinates were evaluated from the emission spectra. Moreover, all the findings recommend these glass as light‐emitting materials in the coral region at 599 nm for solid‐state lighting applications.

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Spectral studies of Dy3+:zincphosphate glasses for white light source emission applications: A comparative study

Cited by 103 publications

References 99 publications

Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Excitation expansion in the high‐energy UV region for Dy³⁺‐doped medium‐temperature molten silicate glass phosphors

Orange‐red luminescence of samarium‐doped bismuth–germanium–borate glass for light‐emitting devices

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Spectral studies of Dy3+:zincphosphate glasses for white light source emission applications: A comparative study

Cited by 103 publications

References 99 publications

Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Investigation of Dysprosium‐Incorporated Potassium Boro‐Tellurite Glasses Toward Radiation Screening and Photonic Applications

Excitation expansion in the high‐energy UV region for Dy3+‐doped medium‐temperature molten silicate glass phosphors

Orange‐red luminescence of samarium‐doped bismuth–germanium–borate glass for light‐emitting devices

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Excitation expansion in the high‐energy UV region for Dy³⁺‐doped medium‐temperature molten silicate glass phosphors