Intense green emission from Tb3+ ions doped zinc lead alumino borate glasses for laser and w-LEDs applications

Kaur, Sumandeep; Deopa, Nisha; Prasad, Aman; Bajaj, Rajat; Rao, A.S.

doi:10.1016/j.optmat.2018.07.020

Cited by 66 publications

(11 citation statements)

References 31 publications

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“…The CCT values for the Na 4 Ca 4‐x Si 6 O 18 :xTb 3+

((), 1 \leq normalx \leq 11 mol %)

phosphors were found to be in the range 5500–8500 K. The higher CCT values located under the cool region of the visible colour gamut. The purity of colour for the optimized Tb 3+ ‐doped phosphor was evaluated using the formula [ 57 ] :

italicColor purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{ee})}^{2} + {((), y goodbreak- y_{ee})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{ee})}^{2} + {((), y_{d} goodbreak- y_{ee})}^{2}}} goodbreak\times 100 %

where (x, y) are the coordinates for 9.0 mol% of the Tb 3+ ion incorporated in the Na 4 Ca 4 Si 6 O 18 phosphor,

((),, x_{italicee}, y_{italicee})

are the coordinates corresponding to the equal energy point and

((),, x_{d}, y_{d})

are dominant wavelength point coordinates. The colour purity for the optimized Tb 3+ ‐doped NCMS phosphor was estimated as 82% and 64% for excited under the n‐UV region and UV regions, respectively, for providing a strong green‐emitting phosphor.…”

Section: Resultsmentioning

confidence: 99%

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UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

Chauhan

Jayasimhadri

2022

Luminescence

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Tb3+‐doped Na4Ca4Si6O18 (NCMS:Tb3+) phosphors were synthesized using a solid‐state reaction route with increasing dopant concentration. The phase identification studies for NCMS:Tb3+ phosphors were carried out using an X‐ray diffraction (XRD) technique. The XRD patterns for the as‐synthesized phosphors showed satisfactory agreement with the standard pattern (JCPDS card no. 75‐1687) for the pure phase of the Na4Ca4Si6O18 compound. The morphology and size of particles were illustrated from scanning electron microscope (SEM) micrographs. The photoluminescence excitation (PLE) spectrum of Tb3+‐doped Na4Ca4Si6O18 phosphor depicts the strong excitation peak obtained in the UV spectral region. The trivalent terbium‐activated NCMS phosphors excited in the UV region (232 nm wavelength) exhibited intense emission in the blue (350–470) and green (470–650) spectral regions. When increasing the concentration of Tb3+ ions in the host matrix, the emission colour shifted from the blue to the green region due to cross‐relaxation energy transfer (CRET) mechanisms and showed the tunable behaviour of the Tb3+‐activated as‐synthesized NCMS phosphor. These results demonstrated that the Tb3+‐activated sodium calcium metasilicate phosphor has immense potential to contribute as a green‐ and blue–green‐emitting component in lighting and display device applications.

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“…The CCT values for the Na 4 Ca 4‐x Si 6 O 18 :xTb 3+

((), 1 \leq normalx \leq 11 mol %)

italicColor purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{ee})}^{2} + {((), y goodbreak- y_{ee})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{ee})}^{2} + {((), y_{d} goodbreak- y_{ee})}^{2}}} goodbreak\times 100 %

where (x, y) are the coordinates for 9.0 mol% of the Tb 3+ ion incorporated in the Na 4 Ca 4 Si 6 O 18 phosphor,

((),, x_{italicee}, y_{italicee})

are the coordinates corresponding to the equal energy point and

((),, x_{d}, y_{d})

Section: Resultsmentioning

confidence: 99%

“…McCamy as follows [56] : mized Tb 3+ -doped phosphor was evaluated using the formula [57] : other phosphor materials reported elsewhere under UV and n-UV excitations. [58][59][60][61][62] Among various phosphors, the presented NCMS:…”

Section: Cie Chromaticity Coordinatesmentioning

confidence: 99%

UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

Chauhan

Jayasimhadri

2022

Luminescence

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“…7 F 5 , which are mainly in the green spectral region around 490 nm and 545 nm, respectively. 16,25,30 Cerium in the trivalent oxidation state usually emits ultraviolet or in the blue spectral region. Electric-dipole transitions between the 4f ground state and the 5d excited state of Ce 3+ are parity allowed and have large oscillator strength.…”

Section: Glasses Doped With One Lanthanide-single Systemmentioning

confidence: 99%

CIE color coordinates for the design of luminescent glass materials

Ruivo,

Laia

2023

Color Research & Application

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New photoluminescent materials have numerous possibilities in many different areas from technological applications to contemporary glass art and design, encouraging the development of new forms and products. Glass luminescent materials, known for their exceptional durability and recyclability, position glass as an ideal solution for fostering a more sustainable future. In recent years, white luminescence in glass and ceramics has been the subject of several investigations about its possible application in white light‐emitting diodes (WLED). Color coordinates and CIE chromaticity diagrams serve as valuable tools to represent and define the range of luminescent colors achievable in a particular composition. These aid in understanding wheter a composition can be used to produce white luminescence or various other colors. In this study, a soda‐lime silicate glass composition was doped with a mixture of different lanthanide oxides to increase the luminescence color palette. The same glass sample can also present different colors by changing the excitation light, allowing higher tunability of luminescent colors. It was effectively demonstrated the extensive spectrum of colors produced, which was represented through luminescence color coordinates for all synthesized glasses. Moreover, the possibility of detecting if an excited state process is occurring was studied by calculating the lanthanides factors and comparing them with those used in the glass synthesis. Nevertheless, it is shown that the energy transfer process has to be significant to influence the color coordinates and the calculation of the factors.

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“…Glasses having divalent ions such as Te 2+ , Pb 2+ play a significant role in the modification of property [12][13][14]. It is perceived that the incorporation of metal oxides like PbO, ZnO into the boro-tellurite glass matrix could do changes in the densities and molar volume of the glasses [14][15][16]. It is reported that tellurite (TeO2) converts TeO4 into TeO3+1 and TeO3units when B2O3 is added to the TeO2 glass network and it also improves the ability of glass formation with TeO2 [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Borate-based specimens find widespread applications in all fields due to their various physicalchemical properties [19][20][21]. Additionally, it is shown that the elastic properties associated with acoustic properties are most useful due to their preferred applications in a few devices like light modulators and solid-state sensors [1][2][3]16,21,22].…”

Section: Introductionmentioning

confidence: 99%

Elastic properties of boro-tellurite glasses doped with europium oxide

Devaraja¹,

Gowda²,

Eraiah

et al. 2022

J Met Mater Miner

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The glass series of xEu2O3-5PbO-25TeO2-(70-x) B2O3, where x=0.1 mol% to 0.6 mol% were prepared by employing the conventional melt quenching method. The non-crystallinity of prepared BTE glasses was examined by the X-ray diffraction method. The very important mechanical properties such as elastic moduli, Debye temperature, Poisson’s ratio, fractional bond connectivity, softening temperature, acoustic impedance, and the thermal expansion coefficient of the BTE glasses have been studied by measuring ultrasonic velocity. The experimental results indicate that the calculated parameters strongly depend on increasing Eu2O3 concentration. The elastic moduli of the prepared samples were found to decrease with Eu2O3 concentration and this increases the discontinuity in the glass network.

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Intense green emission from Tb3+ ions doped zinc lead alumino borate glasses for laser and w-LEDs applications

Cited by 66 publications

References 31 publications

UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

CIE color coordinates for the design of luminescent glass materials

Elastic properties of boro-tellurite glasses doped with europium oxide

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Intense green emission from Tb3+ ions doped zinc lead alumino borate glasses for laser and w-LEDs applications

Cited by 66 publications

References 31 publications

UV‐excited blue‐ to green‐emitting Tb3+‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

UV‐excited blue‐ to green‐emitting Tb3+‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

CIE color coordinates for the design of luminescent glass materials

Elastic properties of boro-tellurite glasses doped with europium oxide

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Product

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UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices

UV‐excited blue‐ to green‐emitting Tb³⁺‐activated sodium calcium metasilicate colour tunable phosphor for luminescence devices