Rare earth ion Tb3+ doped natural sodium feldspar (NaAlSi3O8) Luminescent properties and energy transfer

Abstract

In this study, Tb3+—doped natural sodium feldspar (NaAlSi3O8) phosphors have been successfully prepared using high−temperature solid—state method with natural sodium feldspar as a substrate. Energy—dispersive X—ray spectrometry analysis (EDX) of NaAlSi3O8 showed that 0.03 wt% of Eu element was present, and elemental distribution mapping analysis showed that the distribution of trace Eu in minerals was aggregated. The crystal structure and luminescence properties of the natural sodium Eu—containing feldspar and synthetic sodium feldspar NaAlSi3O8:Eu3+, Tb3+ phosphors are discussed in detail. The crystal structure analysis of the samples showed that the Na+ in the natural matrix was partly replaced by the doped Tb3+. Studies on the photoluminescence properties of the samples indicate that Eu does not form a luminescent center in the natural mineral, however, the strong characteristic peak of Eu3+ at 615 nm appears after doping with Tb3+ and the peak at 615 nm increases with the increase of Tb3+ concentration. According to the above spectral results, the energy transfer from Tb3+ to Eu3+ is obtained. Through the measurement and analysis of color coordinates, it is found that with the increase of Tb3+ concentration, the luminescence color of the samples can be regulated in the green to red region. NaAlSi3O8:Eu3+ Tb3+ phosphors has potential application value.

Investigations of Feldspar-Quartz Raw Materials After Firing: Effect of Various Na2O/K2O Ratio and Synthetic Pigments Addition

“…Spectral dependence of the total absorbance in the wavelength range from 220 to 2200 nm measured for selected feldspar-quartz samples after firing is presented in Figure 7. The spectral line shapes of both examined raw material varieties (0 Na, 0 K) are typical for these types of feldspar [27,28]. The presence of a small amount of Fe 2 O 3 in the raw materials (0.30-0.36%) gives a clear manifestation in their optical spectra.…”

“…It can be noted that the bands of I K and I Na samples are quite similar and, except for obvious differences in absorbance intensity, resemble the spectrum of undoped sodium sample. Changes in the electronic structure due to increased amount of iron (Pauling electro-negativity of iron is 1.83) eliminate differences caused by distinct chemical properties of sodium and potassium [27,36].…”

NaAlSiO4: Eu2+ Glass Ceramics: Self‐Reduced In Situ Growth and High‐Power LED/LD Lighting

“…It is well known that aluminosilicate glass is a common material characterized by inexpensive ingredients for easy mass production, relatively high thermal conductivity (≈1.0 W m −1 K −1 ) and remarkable physical/chemical stability, because of its stable structure 1b, several famous luminescent hosts, [42][43][44][45] for instance nepheline (N-NASO), low carnegieite (L-NASO), high carnegieite (H-NASO), and albite (NaAlSi 3 O 8 ), could be precipitated by modifying the chemical compositions. To lower the melting point, some components are introduced in the form of fluoride, such as, NaF and LnF 3 (Ln = Y, Eu).…”

Eu- and Tb-adsorbed Si3N4 and Ge3N4: Tuning the colours with one luminescent host

“…The energy level distributions of Tb 3+ and Eu 3+ ions show a large overlap and their energy transfer has been proven to be very effective. [56] The blue-green light of the Tb 3+ transition ( 5 D4 → 7 F6,5) is emitted by polychromatic relaxation and the energy is transferred to the 5 D1 and 5 D0 levels of the Eu 3+ by cross relaxation. The Eu 3+ ions absorbing the energy from Tb 3+ emit therefore orange light.…”