Luminescence properties of CdSiO3:Mn2+ phosphor

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

doi:10.1016/j.jlumin.2004.02.010

Cited by 46 publications

(16 citation statements)

References 21 publications

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“…Exhibiting a 3 d 5 electronic configuration, photoemission typically occurs via 4 G→ 6 S transitions. The energy gap of this transition is strongly dependent on ligand field strength, and hence, luminescence may occur over a very broad spectral range 2–6 . For example, if Mn 2+ exists in tetrahedral coordination such as in Zn 2 SiO 4 , the crystal field is relatively weak and luminescence typically occurs in the green spectral range 7 .…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses

Yan

Liu

Chen

et al. 2011

Journal of the American Ceramic Society

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We report on photoluminescence from Mn 21 -doped chalcohalide glasses of the GeS 2 -Ga 2 S 3 -CsCl system. Upon blue excitation at 447 nm, a broad emission band occurs in the green spectral range from 500 to 600 nm, indicating the presence of tetrahedrally coordinated Mn 21 species. When the Mn 21 -concentration is increased up to 2 mol%, an increasingly intense secondary emission band evolves at about 610-660 nm. Meanwhile, the intensity of the green band decreases gradually and shifts toward the red, resulting a very flatten luminescence from 500 to 750 nm, which provides a promising white light emitting source. As for the origin of this unique luminescence behavior of Mn 21 , it is proposed that the ligand coordination number of Mn 21 in the present chalcohalide glasses experiences a partial change from tetrahedral to octahedral coordination.

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Section: Introductionmentioning

confidence: 99%

Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses

Yan

Liu

Chen

et al. 2011

Journal of the American Ceramic Society

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“…The majority of electrons stored in the electron traps transfers to the excited state of Mn 2+ ions. 6 Finally, the excited state of Mn 2+ ions decay radiatively into the ground state with the red phosphorescence due to the 4 T 1 → 6 A 1 transition resulting in red LLP of Mn 2+ . The mechanism of the phosphorescence can be formulated in detail using a simplified scheme as shown in Fig.…”

Section: Effect Of Yb 2 O 3 On the Phosphorescence Properties Ofmentioning

confidence: 99%

“…Many studies on the luminescence behaviors of the Mn 2+ activator have been reported. [6][7][8][9] The 3d 5 multiplet energies of Mn 2+ in crystals depend largely on the covalency interaction with the host crystal or the crystal field, because the 3d electrons of the transition metal ions are the outermost ones. The octahedral coordinated Mn 2+ ion exhibits orange to red emissions.…”

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confidence: 99%

Enhanced Red Phosphorescence in MgGeO[sub 3]:Mn[sup 2+] by Addition of Yb[sup 3+] Ions

Yue

et al. 2009

J. Electrochem. Soc.

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Enhancement of the 4 T 1g ͑ 4 G͒ → 6 A 1g ͑ 6 S͒ red emission of MgGeO 3 :1% Mn 2+ with addition of Yb 2 O 3 is reported. The initial phosphorescence in the Yb 2 O 3 codoped sample is an order of magnitude stronger than that of the Yb 2 O 3-free sample. Thermoluminescence spectra indicate that the introduction of Yb 3+ into the host produces traps with a suitable depth, resulting in the enhanced red phosphorescence of Mn 2+. The possible mechanism for this phenomenon is explained by a competitive trapping model.

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“…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.

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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 ...

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Luminescence properties of CdSiO3:Mn2+ phosphor

Cited by 46 publications

References 21 publications

Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses

Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses

Enhanced Red Phosphorescence in MgGeO[sub 3]:Mn[sup 2+] by Addition of Yb[sup 3+] Ions

Low temperature synthesis of CdSiO3 nanostructures

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Luminescence properties of CdSiO3:Mn2+ phosphor

Cited by 46 publications

References 21 publications

Photoluminescence of Mn2+ Centers in Chalcohalide Glasses

Photoluminescence of Mn2+ Centers in Chalcohalide Glasses

Enhanced Red Phosphorescence in MgGeO[sub 3]:Mn[sup 2+] by Addition of Yb[sup 3+] Ions

Low temperature synthesis of CdSiO3 nanostructures

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Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses

Photoluminescence of Mn²⁺ Centers in Chalcohalide Glasses