Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

Zeuner, Martin; Pagano, Sandro; Schnick, Wolfgang

doi:10.1002/9783527631940.ch60

Cited by 38 publications

(56 citation statements)

References 205 publications

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“…Several review articles have been published that summarize the accomplishments in the field before the year 2011 [12,[25][26][27] , are coordinated directly with nitrogen atoms. The coordinating bonds thus are more covalent and have higher polarizability than those with halides and oxygen (i.e., Nephelauxetic effect) [28].…”

Section: Introductionmentioning

confidence: 99%

“…This coordinating environment results in a relatively large centroid shift of 4f-5d transition energy which corresponds to an optical absorption and emission in relatively low energy. Typically, the absorption of Eu2 + −activated nitride phosphors is in blue to nUV spectral region while the emission is in green to red spectral region [12,[25][26][27]. Inspired by the research results, many different crystalline nitrides and oxynitrides have been studied as candidate phosphor host crystals.…”

Section: Introductionmentioning

confidence: 99%

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Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs

Tian

2014

J Sol State Light

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This article briefly reviews the developments of the phosphors with high thermal stability and high efficiency for use in phosphor-converted LED (pcLED) packages by Lightscape Materials Inc. (wholly owned by The Dow Chemical Company). The current industry design objectives for pcLED packages are first outlined with emphasis on the emission spectral features required for target brightness and color characteristics for general illumination and back light unit for liquid crystal displays. There is a growing demand on thermal stability of the phosphor emission as the LED package power increases. A phenomenological analysis is described on luminescence loss and its relation to thermal stability of luminescence emission at elevated temperatures, which serves as an empirical guide in the search for new phosphor materials of high thermal stability. Finally, the formulations and luminescence properties of the proprietary carbidonitride and oxycarbidonitride phosphors are discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs

Tian

2014

J Sol State Light

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“…The existence of the intergranular phase indicates the presence of a weak grain boundary structure that was suitable for the crack deflection and pullout during the fracturing. In fact, without the whisker microstructure, a high toughness and high strength would be very difficult to achieve in the SiAlON-based ceramic materials [32]. In general, the densification of β-SiAlON can be accelerated by more liquid phases and a lower viscosity [33][34][35][36][37].…”

Section: Effects Of the Z Value On The Mechanical Propertiesmentioning

confidence: 99%

THE SHRINKAGE, PHASE COMPOSITION AND MECHANICAL PROPERTIES OF CERAMICS WITH DIFFERENT β-SiAlON MAIN CRYSTALLINE PHASES PREPARED BY STEREOLITHOGRAPHY

Tian¹

2020

Ceramics - Silikaty

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In this paper, using Si 3 N 4 , Al 2 O 3 and AlN particles as raw materials, β-SiAlON ceramics with different main crystal phases were designed. The green body of the β-SiAlON-matrix ceramic samples were obtained by using stereolithography (SLA) additive manufacturing. After degreasing, dense β-SiAlON ceramics with different SiAlON phases were fabricated through gas pressure sintering at 1800 °C for 1 hour at GPa. The effects of the different Al 2 O 3 contents on the shrinkage, phase composition, relative density, microstructure, mechanical property and hardness were studied. The results indicate that the main phase of the ceramics was β-SiAlON and the specific chemical compositions of it were Si 5 AlON 7 , Si 3.1 Al 2.9 O 2.9 N 5.1 and Si 2 Al 4 O 4 N 4 . The intergranular phases that exists were mainly Y 3 Al 5 O 12 , YAlO 3 and Al 2 O 3 . With a relative density of 90.03 %, the Vickers hardness (Hv5), bending strength and fracture toughness of the fabricated β-Si 5 AlON 7 ceramics were 16.8 GPa, 465 MPa and 4.84 MPa•m 1/2 , respectively. Meanwhile, the shrinkage of the materials was 28.7 %

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“…3-6. An important subclass of oxynitrides is formed by oxonitridosilicates. 7 Among them, the compounds belonging to the Sr-Si-O-N system recently have attracted attention of a number of researchers developing new optoelectronic materials. In this system, nine quaternary materials differing by composition or structure have already been synthesized (see Table I 23 ), and Sr-Si-O-N glass.…”

Section: Introductionmentioning

confidence: 99%

Equation of state for Eu-doped SrSi2O2N2

Ermakova

Paszkowicz

Kamińska

et al. 2014

The Journal of Chemical Physics

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α-SrSi2O2N2 is one of the recently studied oxonitridosilicates applicable in optoelectronics, in particular in white LEDs. Its elastic properties remain unknown. A survey of literature shows that, up to now, nine oxonitridosilicate materials have been identified. For most of these compounds, doped with rare earths and manganese, a luminescence has been reported at a wavelength characteristic for the given material; all together cover a broad spectral range. The present study focuses on the elastic properties of one of these oxonitridosilicates, the Eu-doped triclinic α-SrSi2O2N2. High-pressure powder diffraction experiments are used in order to experimentally determine, for the first time, the equation of state of this compound. The in situ experiment was performed for pressures ranging up to 9.65 GPa, for Eu-doped α-SrSi2O2N2 sample mounted in a diamond anvil cell ascertaining the hydrostatic compression conditions. The obtained experimental variation of volume of the triclinic unit cell of α-SrSi2O2N2:Eu with rising pressure served for determination of the Birch-Murnaghan equation of state. The determined above quoted bulk modulus is 103(5) GPa, its first derivative is 4.5(1.1). The above quoted bulk modulus value is found to be comparable to that of earlier reported oxynitrides of different composition.

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Nitridosilicates and Oxonitridosilicates: From Ceramic Materials to Structural and Functional Diversity

Cited by 38 publications

References 205 publications

Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs

Development of phosphors with high thermal stability and efficiency for phosphor-converted LEDs

THE SHRINKAGE, PHASE COMPOSITION AND MECHANICAL PROPERTIES OF CERAMICS WITH DIFFERENT β-SiAlON MAIN CRYSTALLINE PHASES PREPARED BY STEREOLITHOGRAPHY

Equation of state for Eu-doped SrSi2O2N2

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