Pink light emitting long-lasting phosphorescence in Sm3+-doped CdSiO3

Lei, Bingfu; Liu, Yingliang; Liu, Jie; Ye, Zeren; Shi, Chen

doi:10.1016/j.jssc.2003.11.006

Cited by 95 publications

(51 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A survey on the reported unit-cell parameters and space groups for pseudowollastonite CaSiO 3 published by Yang and Prewitt [5] mentions several works favoring either monoclinic or triclinic symmetries. Due to the resemblance between the pseudowollastonite CaSiO 3 and CdSiO 3 , Lei et al [6] have argued that the crystal structure of the latter is expected to be an one-dimensional chain of edge-sharing SiO 4 tetrahedra.Cadmium germanate ðCdGeO 3 Þ at room temperature and atmospheric pressure has a complex structure resembling the pyroxenoids. Four CdGeO 3 polymorphs in the temperature range from 600°C to 1200°C and varying pressure up to 12 GPa were found by Susaki [7].…”

mentioning

confidence: 99%

CdXO3 (X = C, Si, Ge, Sn, Pb) electronic band structures

Barboza

Henriques

Albuquerque

et al. 2009

Chemical Physics Letters

View full text Add to dashboard Cite

a b s t r a c tElectronic properties for a set of CdXO 3 (X = C, Si, Ge, Sn, Pb) crystals were investigated using the density functional theory (DFT) formalism considering both the local density and generalized gradient approximations, LDA and GGA, respectively. Hexagonal CdCO 3 and triclinic CdSiO 3 have indirect main energy band gaps while orthorhombic CdGeO 3 and CdSnO 3 exhibit direct interband transitions. Orthorhombic CdPbO 3 has a very small indirect band gap. The Kohn-Sham minimum electronic band gap oscillates as a function of the X ns level, changing from 2.94 eV (hexagonal CdCO 3 ; LDAÞ to 0.012 eV (orthorhombic CdPbO 3 ; LDA).Ó 2009 Elsevier B.V. All rights reserved.CdXO 3 (X = C, Si, Ge, Sn, Pb) crystals exhibit several polymorphs and have a wide range of applications. Starting with CdCO 3 , nanoparticles were synthesized through the sonochemical method [1], and shape-controlled hydrothermal synthesis of single-crystalline hexagonal CdCO 3 nanowires, nanobelts, nanorolls, and other onedimensional nanostructures was achieved [2], with the possibility of transforming them into oriented nanoporous CdO. An aragonitetype phase was also found for CdCO 3 by Liu and Lin [3]. Cadmium silicate (CdSiO 3 ), on the other hand, is used as a host matrix for rare-earth doping, allowing for the production of multicolored long-lasting phosphorescence materials [4]. X-ray diffraction data for CdSiO 3 samples revealed a phase structure similar to that of pseudowollastonite CaSiO 3 (JCPDS 35-0810). A survey on the reported unit-cell parameters and space groups for pseudowollastonite CaSiO 3 published by Yang and Prewitt [5] mentions several works favoring either monoclinic or triclinic symmetries. Due to the resemblance between the pseudowollastonite CaSiO 3 and CdSiO 3 , Lei et al. [6] have argued that the crystal structure of the latter is expected to be an one-dimensional chain of edge-sharing SiO 4 tetrahedra.Cadmium germanate ðCdGeO 3 Þ at room temperature and atmospheric pressure has a complex structure resembling the pyroxenoids. Four CdGeO 3 polymorphs in the temperature range from 600°C to 1200°C and varying pressure up to 12 GPa were found by Susaki [7]. The pyroxenoid phase ðCdGeO 3 IÞ is transformed successively into garnet ðCdGeO 3 IIÞ, ilmenite (CdGeO 3 III, hexagonal) and perovskite (CdGeO 3 IV, orthorhombic with increasing pressure. The orthorhombic perovskite phase has Pbnm symmetry, with each germanium (coordination number IV) atom connected to six oxygen atoms, forming a tridimensional array of GeO 6 tilted octahedra with cadmium atoms inserted between them [8]. In order to understand the mechanisms behind the stabilization of the various perovskite crystals, CdGeO 3 , CaGeO 3 , CaSiO 3 , MgSiO 3 and other ABO 3 structures have been investigated [9]. Cadmium stannate ðCdSnO 3 Þ is a semiconducting oxide with gas-sensing properties [10][11][12], and experimental electronic energy band gap of 3.0 eV. Refinement of the CdSnO 3 structure confirms that it is a distorted orthorhombic perovskite, isostructura...

show abstract

mentioning

confidence: 99%

CdXO3 (X = C, Si, Ge, Sn, Pb) electronic band structures

Barboza

Henriques

Albuquerque

et al. 2009

Chemical Physics Letters

View full text Add to dashboard Cite

show abstract

“…Many metal silicates have been reported, and are being used in many areas: Mg 2 SiO 4 :Tb in thermoluminescence dosimetry of the ionizing radiations [14], Gd 2 SiO 5 :Ce in scintillation phosphors because of their relatively high-density, good light output, and fast decay time [15]. Zn 2 SiO 4 :Mn was also used as the green component in the first tri-color lamp [16], CdSiO 3 shows excellent phosphorescence property when doped with some transition metal and rare earth ions [17][18][19]. It is accepted that Sm 3 þ ions in CdSiO 3 host materials [18], can exhibit the dominant pink emission peaks under near-UV excitation.…”

Section: Introductionmentioning

confidence: 99%

“…Zn 2 SiO 4 :Mn was also used as the green component in the first tri-color lamp [16], CdSiO 3 shows excellent phosphorescence property when doped with some transition metal and rare earth ions [17][18][19]. It is accepted that Sm 3 þ ions in CdSiO 3 host materials [18], can exhibit the dominant pink emission peaks under near-UV excitation. Compared with other rare earth ions, the color-rendering index on the proper host materials such as Ca 3 Y(VO 4 ) 3 , CaF 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaF flux on microstructure and thermoluminescence properties of Sm3+ doped CdSiO3 nanophosphor

Manjunatha

Nagabhushana

Sunitha

et al. 2013

Journal of Luminescence

View full text Add to dashboard Cite

a b s t r a c tThis work reports the preparation of CdSiO 3 :Sm 3 þ (1-7 mol%) nanophosphors by a low temperature solution combustion method. For the first time the effect of NaF flux on the crystallization behavior, morphology, and thermoluminescence property of 5 mol% Sm 3 þ doped CdSiO 3 has been investigated. The nanopowders are well characterized by powder X-ray diffraction (PXRD), Fourier Transform InfraRed (FT-IR), and scanning electron microscopy (SEM). PXRD results indicate that the powder calcined at 800 1C for 2 h has monoclinic phase. SEM results show that the powder is highly porous and the pore size and shape can be modified by the addition of NaF flux. Addition of NaF could lead to formation of particle type morphology and the increase in wt% of NaF changes crystallinity and phase. The thermoluminescence glow curves for 2-6 wt% NaF in CdSiO 3 :Sm 3 þ show a single, well resolved glow peak at 126, 130 and 150 1C, respectively. But for the sample prepared with 8 wt% of NaF flux shows two glow peaks at 148 and 220 1C. With the addition of NaF flux, TL intensity can be effectively enhanced.&

show abstract

“…11,12 This type of structure permits easy insertion of ions into the host lattice which can be used to tune the excitation energy storage and subsequent emission at room temperature. 13 In the last decade, a series of long-lasting phosphors based on CdSiO 3 The so-called conventional solid state route for preparing CdSiO 3 consists of thoroughly mixing the precursors (generally CdCO 3 , SiO 2 and the dopant oxide) followed by heating this mixture above 1000 °C for at least 3 h. 15,18,19 This method has some disadvantages, such as high energy consumption and inhomogeneous mixing, resulting in irregularly shaped and aggregated particles. 20 There have been some recent successful attempts at preparing CdSiO 3 at lower temperatures using different precursors.…”

Section: Introductionmentioning

confidence: 99%

Low temperature synthesis of CdSiO3 nanostructures

Santana

Almeida

Soares

et al. 2011

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Descreve-se a síntese de nanoestruturas de CdSiO 3 cristalino como fase única a 580 °C; ao que sabemos, esta é a mais baixa temperatura de formação observada até o presente para este composto. A formação da fase desejada ocorre somente a partir de de 580 °C, já que a 570 °C os picos de difração estão deslocados para menores ângulos em relação ao padrão JCPDS 85-0310. A fonte de silício influencia diretamente a morfologia do material: Na 2 SiO 3 leva à formação de nanopartículas na forma de agulhas, ao passo que sílica mesostruturada de alta área superficial leva a partículas coralóides. A difratometria de raios X em baixo ângulo mostra que o caráter mesosestruturado da sílica precursora não se mantém no CdSiO 3 resultante. A microscopia eletrônica de varredura sugere que, neste caso, haja uma transição da morfologia esférica do precursor para a morfologia em forma de agulhas do material obtido a partir de Na 2 SiO 3 . A área superficial do precursor de sílica utilizado tem influência direta na formação de CdSiO 3 , pois o uso de sílica comercial de menor área superficial não resulta no produto desejado.We report the synthesis of single-phase, crystalline CdSiO 3 nanostructures at 580 °C; to the best of our knowledge, this is the lowest temperature at which this material is reported to form. The desired phase does not form below 580 °C, since the diffraction peaks are shifted to lower angles in the material treated at 570 °C when compared to JDPDS Card No. 85-0310. The source of silicon has strong influence on the product morphology: Na 2 SiO 3 yields single-phase CdSiO 3 in needle-shaped nanostructures, while high surface area mesostructured SiO 2 yields coralloidshaped particles. Low angle X-ray diffractometry reveals that the mesostructured nature of the silica precursor is not maintained in the resulting CdSiO 3 . Scanning electron microscopy suggests that in this case a transition occurs between the spherical morphology of the precursor and the needle-shape morphology of the material prepared from Na 2 SiO 3 . The surface area of the silica precursor has a strong influence in the reaction, since the use of commercial silica with a lower surface area does not yield the desired product.Keywords: cadmium metasilicate, morphology control, molten precursor method IntroductionIn recent years, compounds that exhibit the property of long lasting phosphorescence (LLP) have become of great interest. This phenomenon is observed when a compound is capable of absorbing visible and UV light, storing the energy and releasing it as visible light, resulting in a long lasting afterglow in the dark.1 These materials have a wide range of applications, such as emergency lighting and road signs, and medicinal applications are possible in principle.2,3 The phenomenon has been known since ancient times and a good example is the Stone of Bologna, studied by Galileo himself, which shows a yellow-orange afterglow when exposed to sunlight due to the presence of BaS impurities. 4-6The silicate family is an attractive class of materials ...

show abstract

Pink light emitting long-lasting phosphorescence in Sm3+-doped CdSiO3

Cited by 95 publications

References 13 publications

CdXO3 (X = C, Si, Ge, Sn, Pb) electronic band structures

CdXO3 (X = C, Si, Ge, Sn, Pb) electronic band structures

Effect of NaF flux on microstructure and thermoluminescence properties of Sm3+ doped CdSiO3 nanophosphor

Low temperature synthesis of CdSiO3 nanostructures

Contact Info

Product

Resources

About