Red, Green, and Blue Photoluminescence of Ba2SiO4:M  (M = Eu3+, Eu2+, Sr2+) Nanophosphors

Streit, Huayna Cerqueira; Kramer, Jennifer R.; Suta, Markus; Wickleder, Claudia

doi:10.3390/ma6083079

Cited by 38 publications

(27 citation statements)

References 23 publications

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“…The activation energy was extracted to be 0.382 eV, which is much larger than the 0.05 eV value of Ba 2 SiO 4 :Eu 2+ . [ 39 ] According to the confi guration coordinates, [ 40 ] the electrons at excited states can be thermally excited with an activation energy Δ E to reach the quenching point. These electrons can then return to the ground states, and the transition energy is released through heat dissipation rather than radiation emission, accompanied with the creation of a large number of phonons.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Liu

Zhang

et al. 2015

Advanced Optical Materials

172

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into visible light. Phosphor plays an important role in determining the performance of white LEDs, such as, their color rendering, luminous effi ciency, lifetime, and so on. [4][5][6][7][8][9][10][11][12][13][14] A number of promising phosphors have already been explored and their suitability for white LEDs has been demonstrated. In particular, nitride phosphors have drawn much attention due to their high chemical and high thermal stability. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] At the operating temperature of current white LEDs (ca. 150 °C), nitride phosphors can maintain 80-90% of the room temperature luminescence intensity, [ 18,[21][22][23][24][25] and some of them can even reach 95% at 200 °C. [ 31 ] Nitride phosphors are usually synthesized via solid-state reaction (SSR), gas reduction and nitridation (GRN), carbothermal reduction and nitridation (CRN), or high-pressure ammonothermal methods. [ 21,22 ] These synthesis techniques are often complex, require expensive and moisture-sensitive raw materials, a long processing time at a high temperature (1400-2000 °C), and a high nitrogen or ammonia pressure (100 MPa), leading to very high costs associated with the production of these phosphors. It is therefore necessary to search for novel phosphors with high effi ciency and low thermal degradation that can be synthesized easily.In this work, we report on a novel orthosilicate phosphor, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , which is synthesized by a simple SSR process at a relatively low reaction temperature of 1400 °C. The optical properties of this phosphor are comparable with those of nitride phosphors. Ba 9 Lu 2 Si 6 O 24 :Ce 3+ exhibits a main excitation band around 400 nm, which matches the emission light of near-UV chips. Under this excitation, it shows a green emission band around 490 nm with a width of 120 nm. Its internal quantum effi ciency (QE) can be as high as 82% with an absorbance of 0.60, resulting in an external QE of about 50%, which is equivalent to that of most nitride phosphors. Moreover, this green phosphor shows a very high thermal stability, and its luminescence intensity at 160 °C preserves nearly 94% of the initial luminescence intensity at room temperature. This is very superior to that of most nitride phosphors. In this paper, the synthesis and the crystal structure analysis of Ba 9 Lu 2 Si 6 O 24 are reported. The origins of the excellent thermal stability are also investigated by using classical thermal quenching theory.Among the inorganic phosphors used in advanced solid-state lighting technologies, nitridosilicates have drawn signifi cant attention because of their superior photoluminescence properties with high effi ciency and high thermal stabilities. However, the synthesis of nitride phosphors usually requires strict processing conditions and a long processing time, leading to very high manufacturing costs. Herein, a novel orthosilicate green phosphor, Ba 9 Lu 2 Si 6 O 24 :Ce 3+ , is synthesized via a simple solid-state reaction. The photoluminescence char...

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Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Liu

Zhang

et al. 2015

Advanced Optical Materials

172

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“…For applications of oxosilicates containing trivalent rare earth elements (REE), see: Kitai (2008); Piccinelli et al (2009) ;Qiao et al (2014); Luo et al (2012); Streit et al (2013); Han et al (2006); Sun et al (2012). For structures isotypic with that of the title compound, see: Zachariasen (1930); Smolin et al (1973); Christensen (1994); Redhammer & Roth (2003).…”

Section: Related Literaturementioning

confidence: 98%

“…Oxosilicates that contain trivalent rare earth elements have been studied frequently because of their potential usage in the field of luminescense including applications in devices and circuits for electronic, optoelectronic as well as communication industries (Kitai, 2008;Piccinelli et al, 2009;Qiao et al, 2014;Luo et al, 2012;Streit et al, 2013;Han et al, 2006;Sun et al, 2012).…”

Section: Commentmentioning

confidence: 99%

Thortveitite-type Tm₂Si₂O₇

Kahlenberg

Aichholzer

2014

Acta Cryst E

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Single crystals of dithulium disilicate, Tm2Si2O7, were obtained in flux synthesis experiments in the system SiO2–Tm2O3–LiF at ambient pressure. The compound belongs to the group of sorosilicates, i.e. it is based on [Si2O7]-units and crystallizes in the thortveitite (Sc2Si2O7) structure type. The Tm3+ cation (site symmetry .2.) occupies a distorted octahedral site, with Tm—O bond lengths in the range 2.217 (4)–2.289 (4) Å. Each of the octahedra shares three of its edges with adjacent [TmO6] groups, resulting in the formation of layers parallel to (001). The individual [SiO4] tetrahedra are more regular, i.e. the differences between the bond lengths between Si and the bridging and non-bridging O atoms are not very pronounced. The layers containing the octahedra and the sheets containing the [Si2O7] groups (point group symmetry 2/m) form an alternating sequence. Linkage is provided by sharing common oxygen vertices.

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“…Auch Wickleder und ihre Arbeitsgruppe in Siegen berichteten von Fortschritten bei silikatbasierenden Farbstoffen 46. Normalerweise entstehen Eu2+‐dotierte Bariumorthosilikate durch Festkörperreaktion mit Kristallitgrößen von einigen Mikrometern.…”

Section: Rot Grün Blau — Effiziente Leuchtstoffeunclassified

Festkörperchemie 2013

2014

Nachr Chem

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Red, Green, and Blue Photoluminescence of Ba2SiO4:M (M = Eu3+, Eu2+, Sr2+) Nanophosphors

Cited by 38 publications

References 23 publications

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Thortveitite-type Tm₂Si₂O₇

Festkörperchemie 2013

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Red, Green, and Blue Photoluminescence of Ba2SiO4:M (M = Eu3+, Eu2+, Sr2+) Nanophosphors

Cited by 38 publications

References 23 publications

Ba9Lu2Si6O24:Ce3+: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba9Lu2Si6O24:Ce3+: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Thortveitite-type Tm2Si2O7

Festkörperchemie 2013

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Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Ba₉Lu₂Si₆O₂₄:Ce³⁺: An Efficient Green Phosphor with High Thermal and Radiation Stability for Solid‐State Lighting

Thortveitite-type Tm₂Si₂O₇