Embodiment of the warm white-light-emitting diodes by using a Ba2+ codoped Sr3SiO5:Eu phosphor

Park, Joung Kyu; Choi, Kyoung‐Jae; Yeon, Jeong Ho; Lee, Seung-Jae; Kim, Chang Hae

doi:10.1063/1.2166471

Cited by 160 publications

(68 citation statements)

References 7 publications

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“…Dieser Fortschritt führte zu einem Bedarf an geeigneten Lumineszenzmaterialien (Leuchtstoffen) für die Erzeugung von weißem Licht, was normalerweise erreicht wird durch: 1) die Verwendung von drei einzelnen monochromatischen LEDs (blau, grün, rot); 2) die Kombination einer ultravioletten LED mit blauen, grünen und roten Leuchtstoffen; oder 3) die Verwendung einer blauen LED zur optischen Anregung von gelben oder grünen und roten Leuchtstoffen. [94] [178][179][180] Aluminate, [180] Sulfide [180,181] und Fluoride [182,183] [89] Man kennt heute mehrere seltenerddotierte (Oxo)nitridosilicate, die interessante Lumineszenzeigenschaften zeigen. Dieser Aufsatz gibt nur einen kurzen Überblick über einige der vielversprechendsten Leuchtstoffe.…”

Section: Lumineszenzunclassified

Nitridosilicate und Oxonitridosilicate: von keramischen Materialien zu struktureller und funktioneller Diversität

Zeuner¹,

Pagano²,

Schnick³

2011

Angewandte Chemie

103

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Silicate sind eine der wichtigsten Verbindungsklassen auf diesem Planeten, und mehr als 1000 Vertreter wurden im Mineralreich bereits identifiziert. Zusätzlich wurden auch mehrere hundert künstliche Silicate synthetisiert. Der Ersatz von Sauerstoff durch Stickstoff führt zur strukturell vielseitigen Klasse der Nitridosilicate. Siliciumnitrid, eines der wichtigsten nichtoxidischen keramischen Materialien, ist die binäre Stammverbindung der Nitridosilicate, und sie symbolisiert die inhärenten Materialeigenschaften dieser Verbindungen. Allerdings ist eine breite systematische Erforschung der Nitridosilicate erst in den letzten Dekaden erfolgt. Mittlerweile haben diese und verwandte Verbindungen ein bemerkenswertes Ausmaß an industrieller Anwendung erreicht. Dieser Aufsatz illustriert jüngste Fortschritte bei der Synthese, der Aufklärung von Struktur‐Eigenschafts‐Beziehungen und den Anwendungen von Nitridosilicaten, Oxonitridosilicaten und den verwandten SiAlONen.

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Section: Lumineszenzunclassified

Nitridosilicate und Oxonitridosilicate: von keramischen Materialien zu struktureller und funktioneller Diversität

Zeuner¹,

Pagano²,

Schnick³

2011

Angewandte Chemie

103

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“…75. This indicates that nitrides have a high degree of condensation due to the fact that the structural possibilities in oxosilicates are limited to terminal oxygen atoms and simple bridging O [2] atoms, whereas the nitrogen atoms in nitrides are generally connected with two (N [2] ), three (N [3] ), even four (N [4] ) silicon atoms such as in BaSi 7 N 10 [23] and MYbSi 4 N 7 (M ¼ Sr, Ba) [24,25]. Consequently, the highly condensed SiN 4 -based networks and the high stability of the chemical bonding between the constituent elements result in the extraordinary chemical and thermal stability of silicon-based oxynitride and nitride materials.…”

Section: Classification and Crystal Chemistry Of Nitride Compoundsmentioning

confidence: 99%

“…The phosphor most commonly utilized in bichromatic white LEDs is the yellow-emitting (Y 1Àa Gd a ) 3 (Al 1Àb Ga b ) O 12 :Ce 3+ (YAG:Ce) [1]. Other types of phosphor such as orthosilicates [3,4], aluminates [5], and sulfides [5,6] have also been used in white LEDs. However, most oxide-based phosphors have low absorption in the visible-light spectrum, making it impossible for them to be coupled with blue LEDs.…”

Section: Introductionmentioning

confidence: 99%

Silicon-based oxynitride and nitride phosphors for white LEDs—A review

Xie

Hirosaki

2007

Science and Technology of Advanced Materials

946

598

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As a novel class of inorganic phosphors, oxynitride and nitride luminescent materials have received considerable attention because of their potential applications in solid-state lightings and displays. In this review we focus on recent developments in the preparation, crystal structure, luminescence and applications of silicon-based oxynitride and nitride phosphors for white light-emitting diodes (LEDs). The structures of silicon-based oxynitrides and nitrides (i.e., nitridosilicates, nitridoaluminosilicates, oxonitridosilicates, oxonitridoaluminosilicates, and sialons) are generally built up of networks of crosslinking SiN 4 tetrahedra. This is anticipated to significantly lower the excited state of the 5d electrons of doped rare-earth elements due to large crystal-field splitting and a strong nephelauxetic effect. This enables the silicon-based oxynitride and nitride phosphors to have a broad excitation band extending from the ultraviolet to visible-light range, and thus strongly absorb blue-to-green light. The structural versatility of oxynitride and nitride phosphors makes it possible to attain all the emission colors of blue, green, yellow, and red; thus, they are suitable for use in white LEDs. This novel class of phosphors has demonstrated its superior suitability for use in white LEDs and can be used in bichromatic or multichromatic LEDs with excellent properties of high luminous efficacy, high chromatic stability, a wide range of white light with adjustable correlated color temperatures (CCTs), and brilliant color-rendering properties. r

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“…Although commercial phosphors for traditional lighting and displays are available, they are not applicable to white LEDs because of their low quantum efficiency (i.e., their conversion from blue light to other visible light). In recent years, the search for appropriate hosts for LED phosphors has been a hot topic for material scientists and chemists [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effects of flux on crystal structure and luminescent properties of nitroxides phosphors

Xie

Shi

Wang

2014

Sci. China Phys. Mech. Astron.

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Yellow-green-emitting SrSi 2 O 2 N 2 :Eu 2+ phosphors were synthesized with Sr 2 SiO 4 :Eu 2+ as precursor. The effects of flux and the concentration of Eu 2+ on the crystal structure and luminescent properties of the phosphors were investigated. Results suggested that the optimal content of flux Na 2 CO 3 was 1 wt% and the optimal doping concentration of Eu 2+ was 0.05 mol. The emission spectra showed the most intense peaks located at 535 nm which corresponded to the 4f 6 5d→4f 7 transition of Eu 2+ . The excitation spectra showed that these phosphors could be effectively excited by near-ultraviolet and blue light, whichwas consistent with the widely applied output wavelengths of near-ultraviolet and blue-white light-emitting diode (LED) chips. When the influence of flux on the luminescent properties of SrSi 2 O 2 N 2 :Eu 2+ phosphor was analyzed, the X-ray diffraction (XRD) patterns indicated that the flux could help the crystallization of the phosphors. No other phases except the triclinic structure of SrSi 2 O 2 N 2 were formed. The thermal stability and the emission intensity of synthesized SrSi 2 O 2 N 2 :Eu 2+ phosphor were examined and compared with commercial YAG yellow phosphors. All results indicate that the yellow-green-emitting phosphor is a suitable candidate for the fabrication of white LEDs. flux, nitrogen oxides, yellow-green-emitting, white LEDs PACS number(s): 78.55.Qr, 78.66.Jg, 81.05.Gc, 33.15.Hp, 78.55.Et Citation:Xie A, Shi Y, Wang Y W. Effects of flux on crystal structure and luminescent properties of nitroxides phosphors.

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Embodiment of the warm white-light-emitting diodes by using a Ba2+ codoped Sr3SiO5:Eu phosphor

Cited by 160 publications

References 7 publications

Nitridosilicate und Oxonitridosilicate: von keramischen Materialien zu struktureller und funktioneller Diversität

Nitridosilicate und Oxonitridosilicate: von keramischen Materialien zu struktureller und funktioneller Diversität

Silicon-based oxynitride and nitride phosphors for white LEDs—A review

Effects of flux on crystal structure and luminescent properties of nitroxides phosphors

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