Preparation and characterization of Eu3+ activated CaSiO3, (CaA)SiO3 [A = Ba or Sr] phosphors

Abstract

Eu 3+ activated CaSiO 3 , (Ca, Ba) SiO 3 and (Ca, Sr) SiO 3 have been prepared by sol-gel technique. Residual solvent and organic contents in the gel were removed by firing at 100°C for 3-4 h at 300 and 600°C for 2 h. Small exothermic shoulder around 850 to 875°C, as observed in DTA curve, corresponds to crystallization temperature of the doped calcium silicate. Influence of firing temperature on the luminescence of Eu 3+ shows the maximum emission intensity in gel fired at 850°C. Photoluminescence emission peak is observed at 614 nm due to 5 D 0 → → 7 F 2 transition of Eu 3+ ion in (Ca, Ba) SiO 3 and (Ca, Sr) SiO 3 phosphors, when excited by 254 nm. The (Ca, Ba) SiO 3 material is proposed as an efficient red phosphor.

Time-resolved fluorescence line-narrowing of Eu^3+ in biocompatible eutectic glass-ceramics

“…The work investigates the microstructural and photoluminescence properties of the binary system CaSiO 3 -Ca 3 (PO 4 ) 2 in the eutectic composition doped with Eu 3+ ions as a function of the crystallization stage of the host matrix. Although photoluminescence properties have been studied in calcium silicate [20][21][22][23], dicalcium silicate [24], apatite-like structure [25][26][27][28], and tricalcium phosphate phosphors [29,30], most of these works deal with low spectral resolved luminescence of Eu 3+ obtained under non-selective UV excitation to explore its intense red emission for applications in phosphor materials [20,22,24,29,30] and drug release tracking [21,23,25]. Site-selective emission spectra of Eu 3+ -doped fluoroapatite and oxyapatite structures are reported in Refs.…”

Novel blue‐emitting SrMg2Al16O27:Eu2+ phosphor for solid‐state lighting

“…The third approach is using near ultraviolet (NUV) or blue LED sources to excite bi-or tri-colour phosphors to generate white light. Recently, we have reported some inorganic phosphors for lamp industry applications, such as silicate (9), tungstate (10,11), vanadates (12,13), sulphates (14)(15)(16)(17)(18)(19), borates (20), oxides (21), aluminates (22)(23)(24), sulphides (25)(26)(27), halophosphors (28)(29)(30)(31) and phosphates (32)(33)(34)(35)(36)(37)(38)(39)(40). Generally speaking.…”

Photoluminescence Property of Eu3+ doped CaSiO3 Nano-phosphor with Controlled Grain Size

“…The observed peaks match to that of compound (JCPDS # 27-28). Except small trace of Ca2SiO4 phase, the observed profile shows triclinic CaSiO3 phase [24]. Since there is no change in peak positions at T > 800 °C , the results suggest that these samples can be sintered well at T = 800 °C .…”

“…In this case, the R 0 value of emulsions was changed from 0.12 to 0.3 as the average grain size of the crystallite, which is obtained because of hydrolysis and condensation reaction of TEOS, appears to depend mainly on R 0 value of the emulsion system from which they are prepared. Further explanation of this is given elsewhere [12][13][14], and it will not be discussed here. Note, in any case, while varying the value of R 0 the overall concentration ratios of ethanol, surfactant and TEOS is kept constant.…”

“…The solutions to these problems have been addressed using rather simple solution-based synthesis techniques such as sol-gel and micro-emulsion, and these techniques are gaining widespread popularity for the past few decades [12][13][14]. Also, these techniques make use of simple room temperature hydrolysis and polycondensation reaction [15,16] of the starting material such as tetraethylorthosilicate (TEOS), yielding glasses and oxide powders of high purity and homogeneity and to some degree with tailored grain size, morphology, and dispersity index.…”