Photoluminescence and decay behavior of Tb3+ ions in sodium fluoro-borate glasses for display devices

Umamaheswari, D.; Jamalaiah, B.C.; Sasikala, T.; Chengaiah, T.; Kim, Il-Gon; Moorthy, L. Rama

doi:10.1016/j.jlumin.2011.12.080

Cited by 80 publications

(15 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

Section: Resultssupporting

confidence: 89%

“…The values of Ω λ were found to be in the following order: Ω 4 > Ω 2 > Ω 6 , and further, the values have proven to be the highest for the glass mixed with 3.0 mol% of Al 2 O 3 . The obtained values of Ω λ are in reasonably good agreement with values reported for several other glass systems (17)(18)(19)(20). Among the three Ω λ parameters, the contribution to Ω 2 is mainly from local crystalline field electronic charge density due to differences in the local distortion at the RE ion sites.…”

Section: Resultssupporting

confidence: 87%

See 1 more Smart Citation

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Kalpana

Gandhi²,

Sudarsan

et al. 2016

Luminescence

View full text Add to dashboard Cite

BaO-B O -P O glasses doped with a fixed concentration of Tb ions and varying concentrations of Al O were synthesized, and the influence of the Al ion concentration on the luminescence efficiency of the green emission of Tb ions was investigated. The optical absorption, excitation, luminescence spectra and fluorescence decay curves of these glasses were recorded at ambient temperature. The emission spectra of terbium ions when excited at 393 nm exhibited two main groups of bands, corresponding to D → F (blue region) and D → 7F (green region). From these spectra, the radiative parameters, viz., spontaneous emission probability A, total emission probability A , radiative lifetime τ and fluorescent branching ratio β, of different transitions originating from the D level of Tb ions were evaluated based on the Judd-Ofelt theory. A clear increase in the quantum efficiency and luminescence of the green emission of Tb ions corresponding to D → F transition is observed with increases in the concentration of Al O up to 3.0 mol%. The improvement in emission is attributed to the de-clustering of terbium ions by Al ions and also to the possible admixing of wave functions of opposite parities. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 87%

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Kalpana

Gandhi²,

Sudarsan

et al. 2016

Luminescence

View full text Add to dashboard Cite

show abstract

“…This indicates that energy migration does not affect the 5 D 4 lifetime (s 3 ) as observed in most Tb 3þ -doped glasses. [3][4][5] The W ph rate is also expected to be negligible due to the large energy gap ($15000 cm À1 ) below the 5 D 4 level. Therefore, we can conclude that the experimentally observed lifetime should be close to 5 D 4 radiative lifetime, s 3rad $ s 3 $ 1.9 ms.…”

Section: Emission Decay Characteristicsmentioning

confidence: 99%

“…This behavior has been attributed to a cross relaxation (CR) process that transfers population from the 5 D 3 to the 5 D 4 , strongly reducing the 5 D 3 lifetime and the blue luminescence intensity with the increase of Tb 3þ concentration, while 5 D 4 lifetime remains approximately constant in most systems. [5][6][7] Another important mechanism that affects 5 D 4 emissions level is the saturation behavior of the green luminescence. This behavior of the green emission with excitation has been observed both under cathode 8 ray and visible light excitations, 2,4 limiting their luminescence efficiency.…”

mentioning

confidence: 99%

Mechanisms of optical losses in the 5D4 and 5D3 levels in Tb3+ doped low silica calcium aluminosilicate glasses

Santos

Terra

Astrath

et al. 2015

Journal of Applied Physics

View full text Add to dashboard Cite

Analysis of energy transfer processes in Yb3+-Tb3+ co-doped, low-silica calcium aluminosilicate glasses J. Appl. Phys. 110, 083108 (2011); 10.1063/1.3653272 Pump-power-controlled luminescence switching in Yb 3 + ∕ Tm 3 + codoped water-free low silica calcium aluminosilicate glasses Appl. Phys. Lett. 91, 071102 (2007); 10.1063/1.2771051 Nd 2 O 3 doped low silica calcium aluminosilicate glasses: Thermomechanical properties J. Appl. Phys. 85, 8112 (1999); 10.1063/1.370649 On the observation of 2.8 μm emission from diode-pumped Er 3+ -and Yb 3+ -doped low silica calcium aluminate glasses Appl. Phys. Lett. 74, 908 (1999);Trivalent Tb-doped materials exhibit strong emission in the green and weak emission in the UVblue levels. Usually, this behavior is attributed to the cross relaxation (CR) process. In this paper, the luminescence properties of Tb 3þ -doped low silica calcium aluminosilicate glasses are analyzed for UV (k exc ¼ 325 nm) and visible (488 nm) excitations. Under 325 nm excitation, the intensity of green luminescence increases proportionally to Tb 3þ concentration. However, the blue luminescence intensity is strongly reduced with the increase of concentration from 0.5-15.0 wt. %. In the case of 488 nm excitation, a saturation behavior of the green emission is observed at intensities two orders of magnitude smaller than expected for bleaching of the ground state population. Using a rate equation model, we showed that this behavior can be explained by an excited state absorption cross section two orders of magnitude larger than the ground state absorption. The blue emission is much weaker than expected from our rate equations (325 nm and 488 nm excitation). We concluded that only the CR process cannot explain the overall feature of measured luminescence quenching in the wide range of Tb 3þ concentrations. Cooperative upconversion from a pair of excited ions ( 5 D 3 : 5 D 3 or 5 D 3 : 5 D 4 ) and other mechanisms involving upper lying states (4f5d, charge transfer, host matrix, defects, etc.) may play a significant role. V C 2015 AIP Publishing LLC.

show abstract

“…The trivalent Sm 3+ ions have a strong luminescence in the reddish-orange range of wavelength due to 4 G 5/2 → 6 H J (J=5/2, 7/2, 9/2) transitions. Simultaneously, the trivalent Tb 3+ ions in different hosts are known as green emitters due to 5 D 4 → 7 F i (i=0, 1, K, 6) transitions [29][30][31][32][33][34]. Moreover, Tb 3+ ions can be also good sensitizer for Sm 3+ ions, which helps to increase reddish-orange luminescence.…”

Section: Introductionmentioning

confidence: 99%

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes

Khan

Dang

Jabarov

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

A series of CaSiO 3 :x%Tb 3+ , y%Sm 3+ compounds was synthesized by the conventional solid state reaction. X-ray diffraction, scanning electron microscopy, and energy dispersive x-ray spectroscopy investigations were conducted to determine crystal structure. The photoluminescence (PL) excitation spectrum of Tb 3+ and Sm 3+ doped compounds consists of a series of peaks corresponding to electronic transitions of Tb 3+ and Sm 3+ ions. The wavelength of 375 nm was optimal to excite the luminescence of Tb 3+ /Sm 3+ co-doped compounds. The PL emission spectrum consists of a set of intense lines at wavelengths of 415 nm, 436 nm, 457 nm, 488 nm, 543 nm, 586 nm, and 622 nm, corresponding to Tb 3+ electronic transitions of 5 D , respectively. The PL emission spectrum of the Sm 3+ doped compound has a series of three peaks located at wavelengths of 565 nm, 602 nm, and 648 nm, corresponding to the electronic transitions of Sm 3+ from 4 G 5/2 to 6 H 5/2 , 6 H 7/2 , and 6 H 9/2 , respectively. The energy level diagram was proposed. The lifetime measurements were conducted for all samples and energy transfer process was also examined by this way. The Commission Internationale de I'Eclairage chromaticity coordinates, correlated color temperature, and color rendering index of phosphors were determined and the results indicate that the obtained materials are optimal candidate for white LED applications.

show abstract

Photoluminescence and decay behavior of Tb3+ ions in sodium fluoro-borate glasses for display devices

Cited by 80 publications

References 35 publications

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Mechanisms of optical losses in the 5D4 and 5D3 levels in Tb3+ doped low silica calcium aluminosilicate glasses

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes

Contact Info

Product

Resources

About

Photoluminescence and decay behavior of Tb3+ ions in sodium fluoro-borate glasses for display devices

Cited by 80 publications

References 35 publications

Improving green emission of Tb3+ ions in BaO‐B2O3‐P2O5 glasses by means of Al3+ ions

Improving green emission of Tb3+ ions in BaO‐B2O3‐P2O5 glasses by means of Al3+ ions

Mechanisms of optical losses in the 5D4 and 5D3 levels in Tb3+ doped low silica calcium aluminosilicate glasses

Study on luminescent properties of Tb3+ and Sm3+ co-doped CaSiO3 phosphors for white light emitting diodes

Contact Info

Product

Resources

About

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Improving green emission of Tb³⁺ ions in BaO‐B₂O₃‐P₂O₅ glasses by means of Al³⁺ ions

Study on luminescent properties of Tb³⁺ and Sm³⁺ co-doped CaSiO₃ phosphors for white light emitting diodes