Geração e controle das cores luz primárias em vidros para dispositivos "full color"

Silva, José Expedito C.; Malta, Oscar L.; Sá, Gilberto F. de; Santa-Cruz, P.A.

doi:10.1590/s0100-40421998000300026

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…Lanthanide (Ln)-containing materials have attracted considerable interest, since, with the judicious selection of red-(Eu 3+ , Pr 3+ , Sm 3+ ), green-(Tb 3+ , Er 3+ ) and blue-(Tm 3+ , Ce 3+ ) emitting ions doped in an inert host, it is possible to design phosphors which emit across the entire visible spectrum with high colour purity. 5,6 Several types of host materials have already been investigated for this purpose including glasses, [6][7][8][9] sol-gels, [10][11][12][13] microporous materials [14][15][16] and semiconductors such as Si or GaN. 5,[17][18][19][20][21][22][23][24] Here we report a step forward towards this goal: the preparation of open-framework lanthanide silicate materials, [Na 1.08 K 0.5 Ln 1.14 Si 3 O 8.5 $1.78H 2 O] (known as Ln-AV-20 materials), 25 In the Ln-AV-20 system stoichiometric amounts of the lanthanide ions are embedded directly into the silicate framework.…”

Section: Introductionmentioning

confidence: 99%

Tuning the emission colour in mixed lanthanide microporous silicates: energy transfer, composition and chromaticity

et al. 2008

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The Ln-AV-20 structure is able to incorporate several different Ln 3+ ions, which emit in different spectral regions, enabling the possibility of multi-colour capability. Using a study of the energy transfer dynamics in Gd 1À(a+b) Tb a Eu b -AV-20 materials, we show that the emission chromaticity of these systems may be fine-tuned in the red-green spectral region simply by changing the excitation wavelength and/or the sample composition. We show that a study of the energy transfer kinetics, in these and in related materials, can provide useful insight when the design of a material with a specific emission profile is required. By replacing Gd 3+ with Ce 3+ , a system with full-colour capability, Ce 0.53 Tb 0.35 Eu 0.12 -AV-20, has been prepared. The emission colour coordinates for this material at room-temperature are x,y ¼ 0.34, 0.33, which is in good agreement with the values given by the CIE for a white standard.

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