A blue–green-emitting phosphor Na2Ca3Si2O8:Tb3+ with tunable emission color manipulated by cross-relaxation

Fu, Yinrong; Hu, Yihua

doi:10.1007/s10854-015-4235-1

Cited by 9 publications

(8 citation statements)

References 23 publications

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“…However, when the Tb 3+ concentration is low, the Tb-Tb distance is long enough to inhibit the cross relaxation, favoring the blue emission from the 5 D 3 level. In literature, the Tb 3+ blue emission is reported for concentration less than 0.01 at% [10,25], but in the present case, the intense blue emission begins to take place at Tb 3+ concentrations relatively high (~1%). Also, host matrix with phonon energy lower than 1000 cm −1 favors the 5 D 3 blue emission due to the absence of multi phonon relaxation [26].…”

Section: Resultscontrasting

confidence: 53%

See 1 more Smart Citation

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Bispo‐Jr

Lima

Pires

2018

Journal of Luminescence

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Section: Resultscontrasting

confidence: 53%

“…Usually, the Tb 3+ blue emission is very weak due to the cross relaxation mechanism involving the 5 D 3 and 5 D 4 levels which quenches the 5 D 3 emission (see Eq. (1)) [25]. However, when the Tb 3+ concentration is low, the Tb-Tb distance is long enough to inhibit the cross relaxation, favoring the blue emission from the 5 D 3 level.…”

Section: Resultsmentioning

confidence: 99%

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Bispo‐Jr

Lima

Pires

2018

Journal of Luminescence

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“…If so, several very recent publications on the luminescent properties of REE-doped Na 2 Ca 3 Si 2 O 8 where phase identification was solely based on the evaluation of powder diffraction patterns using the PDFentry 00-023-0668 have to be revised (Jin et al 2015;Fu and Hu 2016).…”

Section: Discussionmentioning

confidence: 99%

“…His high quality data were later used for creating the entries 00-023-0668 and 00-023-0670, respectively, of the PDF-4 Powder Diffraction File database issued by the International Centre for Diffraction Data (ICDD). These entries in turn were the primary source for phase identification of polycrystalline Na 2 Ca 3 Si 2 O 8 in several subsequent papers using diffraction methods (Zhang et al 2009;Kuo 2014;Jin et al 2015;Fu and Hu 2016). Unfortunately, however, Maki did not perform a more detailed chemical analysis of his synthesis products.…”

Section: Editorial Handling: M Atm Broekmansmentioning

confidence: 99%

On the existence of a high-temperature polymorph of Na2Ca6Si4O15—implications for the phase equilibria in the system Na2O-CaO-SiO2

Kahlenberg

Maier

2016

Miner Petrol

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Singe crystals of a new high-temperature polymorph of Na 2 Ca 6 Si 4 O 15 have been obtained from solid state reactions performed at 1300°C. The basic crystallographic data of this so-called β-phase at ambient conditions are as follows: space group P1c1, a = 9.0112(5) Å, b = 7.3171(5) Å, c = 10.9723(6) Å, β = 107.720(14)°, V = 689.14(7) Å 3 , Z = 2. The crystals showed twinning by reticular merohedry (mimicking an orthorhombic C-centred unit cell) which was accounted for during data processing and structure solution. Structure determination was accomplished by direct methods. Least-squares refinements resulted in a residual of R(|F|) = 0.043 for 5811 observed reflections with I > 2σ(I). From a structural point of view β-Na 2 Ca 6 Si 4 O 15 can be attributed to the group of mixed-anion silicates containing [Si 2 O 7 ]-dimers as well as isolated [SiO 4 ]-tetrahedra in the ratio 1:2, i.e. more precisely the formula can be written as Na 2 Ca 6 [SiO 4 ] 2 [Si 2 O 7 ]. The tetrahedral groups are arranged in layers parallel to (100). Sodium and calcium cations are located between the silicate anions for charge compensation and are coordinated by six to eight nearest oxygen ligands. Alternatively, the structure can be described as a mixed tetrahedral-octahedral framework based on kröhnkite-type [Ca(SiO 4 ) 2 O 2 ]-chains in which the CaO 6 -octahedra are corner-linked to bridging SiO 4 -tetrahedra. The infinite chains are running parallel to [001] and are concentrated in layers parallel to (010). Adjacent layers are shifted relative to each other by an amount of +δ or −δ along a*. Consequently, a … ABABAB… stacking sequence is created. A detailed comparison with related structures such as α-Na 2 Ca 6 Si 4 O 15 and other A 2 B 6 Si 4 O 15 representatives including topological as well as group theoretical aspects is presented. There are strong indications that monoclinic Na 2 Ca 3 Si 2 O 8 mentioned in earlier studies is actually misinterpreted β-Na 2 Ca 6 Si 4 O 15 . In addition to the detailed crystallographic analysis of the previously unknown compound our results will also help to improve the interpretation of the phase relationships between the compounds in the ternary system Na 2 O-CaO-SiO 2 which are of interest for several applications related to the field of applied mineralogy and materials science.

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“…[40] Figure 6 level to various ground-state energy levels. [41,42] In the emission spectra, the peaks originated in the preliminary range, located at 377, 419, 436, and 458 nm, and corresponded to 5 D 3 ! 7 F 6 , 7 F 5 , 7 F 4 , and 7 F 3 transitions, respectively.…”

Section: Diffuse Reflectance Spectra (Drs)mentioning

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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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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A blue–green-emitting phosphor Na2Ca3Si2O8:Tb3+ with tunable emission color manipulated by cross-relaxation

Cited by 9 publications

References 23 publications

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

On the existence of a high-temperature polymorph of Na2Ca6Si4O15—implications for the phase equilibria in the system Na2O-CaO-SiO2

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

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A blue–green-emitting phosphor Na2Ca3Si2O8:Tb3+ with tunable emission color manipulated by cross-relaxation

Cited by 9 publications

References 23 publications

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

On the existence of a high-temperature polymorph of Na2Ca6Si4O15—implications for the phase equilibria in the system Na2O-CaO-SiO2

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

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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