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Highly Reliable White LEDs Using Nitride Phosphors
Xie, Rong-Jun,Hirosaki, Naoto,Takeda, Takashi The Korean Ceramic Society 2012 한국세라믹학회지 Vol.49 No.4
Nitride phosphors are now attracting significant attention of material scientists and phosphor engineers, because they promise red-shifted photoluminescence spectra, small Stokes shift, high quantum efficiency and low thermal degradation. A number of interesting nitride phosphors have been developed and practiced for producing white light with LED chips. In this paper, the applications of nitride phosphors in highly reliable wLEDs will be overviewed.
Highly Reliable White LEDs Using Nitride Phosphors
Rong-Jun Xie,Naoto Hirosaki,Takashi Takeda 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.4
Nitride phosphors are now attracting significant attention of material scientists and phosphor engineers, because they promise red-shifted photoluminescence spectra, small Stokes shift, high quantum efficiency and low thermal degradation. A number of interesting nitride phosphors have been developed and practiced for producing white light with LED chips. In this paper, the applications of nitride phosphors in highly reliable wLEDs will be overviewed.
Materials Development in α-Sialon Ceramics
Mitomo Mamoru,Xie Rong-Jun,Hirosaki Naoto The Korean Ceramic Society 2006 한국세라믹학회지 Vol.43 No.8
The solid solutions of ${\alpha}-Si_3N_4$, i.e. ${\alpha}$-sialons, are represented by a general formula of $M_x(Si,Al)_{12}(O,N)_{16}$, in which metal ions (M) dissolve into interstitial sites to stabilize the structure. Processing methods for the fabrication of ${\alpha}/{\beta}$-sialon composites, ${\alpha}-sialon/{\beta}Si_3N_4$ composites, refractory or tough ${\alpha}$-sialon ceramics have been developed to tailor the mechanical properties. Translucent and photoluminescent properties have been investigated recently. A number of applications of ${\alpha}$-sialon ceramics as engineering and optical ceramics are also presented.
Materials Development in α-Sialon Ceramics
Mamoru Mitomo,Rong-Jun Xie,Naoto Hirosaki 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.8
The solid solutions of α-Si3N4, i.e. α-sialons, are represented by a general formula of M x(Si,Al)12(O,N)16, in which metal ions (M)dissolve into interstitial sites to stabilize the structure. Processing methods for the fabrication of α/β-sialon composites, α-sialon/β-Si3N4 composites, refractory or tough α-sialon ceramics have been developed to tailor the mechanical properties. Translucent andphotoluminescent properties have been investigated recently. A number of applications of α-sialon ceramics as engineering andoptical ceramics are also presented.
Sohn, Kee-Sun,Lee, Bonghyun,Xie, Rong-Jun,Hirosaki, Naoto Optical Society of America 2009 Optics letters Vol.34 No.21
<P>The emission band of Sr(2)Si(5)N(8):Eu(2+) phosphors consists of two peaks originating from two different crystallographic sites for Eu(2+) activators in the Sr(2)Si(5)N(8) structure. The two-peak emission behavior is closely related to the energy transfer between activators at those sites. A rate-equation model involving the crystallographic information of the host was used to quantify the time-resolved photoluminescence spectra and to systematically analyze the energy transfer behavior.</P>