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Yasushita, Chihiro,Kato, Hideki,Kakihana, Masato The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.3
An almost pure phase of $Ba_3Si_6O_{12}N_2$ doped with $Eu^{2+}$ was successfully synthesized through the ammonia nitridation of an oxide precursor prepared through an aqueous-solution method, using propylene- glycol-modified silane. The emission peak intensity of the obtained $Ba_3Si_6O_{12}N_2:Eu^{2+}$ was -2.2 times higher than that of the sample prepared through a solid-state reaction method.
Chihiro Yasushita,Hideki Kato,Masato Kakihana 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
An almost pure phase of Ba3Si6O12N2 doped with Eu2+ was successfully synthesized through the ammonia nitridation of an oxide precursor prepared through an aqueous-solution method, using propylene- glycol-modified silane. The emission peak intensity of the obtained Ba3Si6O12N2:Eu2+ was −2.2 times higher than that of the sample prepared through a solid-state reaction method.
김지해,Hideki Kato,Masato Kakihana 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
We have conducted two kinds of the so-called charge-compensated aliovalent element substitutions to control the photoluminescence properties of NaAlSiO4:Eu2+ with a special focus on the enhancement of the excitation intensity at 400 nm. The aliovalent element substitutions include cation–cation and cation–anion co-substitutions according to the general formulas Na1−xMxAl1+xSi1−xO4:Eu2+ and Na1−xMxAlSiO4−xNx:Eu2+ (M = Mg2+, Ca2+, and Sr2+), respectively. The increase in the relative excitation intensity at 400 nm has been achieved in both types of the co-substitutions. Thus, the present research has demonstrated the effectiveness of the charge-compensated element substitution.
Kim, Jihae,Kato, Hideki,Kakihana, Masato The Korean Infomation Display Society 2012 Journal of information display Vol.13 No.3
We have conducted two kinds of the so-called charge-compensated aliovalent element substitutions to control the photoluminescence properties of $NaAlSiO_4:Eu^{2+}$ with a special focus on the enhancement of the excitation intensity at 400 nm. The aliovalent element substitutions include cation-cation and cation-anion co-substitutions according to the general formulas $Na_{1-x}M_xAl_{1+x}Si_{1-x}O_4:Eu^{2+}$ and $Na_{1-x}M_xAlSiO_{4-x}N_x:Eu^{2+}$ (M = $Mg^{2+}$, $Ca^{2+}$, and $Sr^{2+}$), respectively. The increase in the relative excitation intensity at 400 nm has been achieved in both types of the co-substitutions. Thus, the present research has demonstrated the effectiveness of the charge-compensated element substitution.
New design of nano-structured SrTiO<sub>3</sub> powder using a cellulose-assisted LPP method
Roh, Yoon Ah,Kang, Bong Kyun,Song, Young-Hyun,Masato, Kakihana,Masaki, Takaki,Yoon, Dae-Ho Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.7
<P><B>Abstract</B></P> <P>Strontium titanate (SrTiO<SUB>3</SUB>) powder has been prepared through a liquid-phase precursor (LPP) method involving strontium (Sr) acetate and different types of titanium (Ti) raw materials; the powders were synthesized using two kinds of lactate complex and TiCl<SUB>3</SUB>. The effects from the addition of the Ti raw materials to the nanostructure and the resultant synthetic efficiency were investigated in this work for the development of nano-sized particles and a low firing temperature. The morphology and size of the SrTiO<SUB>3</SUB> nanopowders were controlled by adjusting the Sr- and Ti-precursor concentrations and the selection of the type of Ti raw material. The most-effective raw material was selected and then used as the basis for the attainment of the results in accordance with the ratio. Using X-ray diffraction (XRD), phase analyses of the samples calcined at different temperatures and compositions were performed. SEM was used for the characterization of the morphologies of the raw materials and reaction products, and they varied from ~25nm to ~50nm.</P>
Synthesis and Luminescence Properties of a Cyan-blue Thiosilicate-based Phosphor SrSi2S5:Eu2+
Masayoshi Nakamura,Hideki Kato,Yuji Takatsuka,Valery Petrykin,Satoko Tezuka,Masato Kakihana 한국정보디스플레이학회 2010 Journal of information display Vol.11 No.4
A series of Sr-Si-S compounds was synthesized using an advanced chemical method in which the use of one solution-based process uniformly dispersed the Eu2+ activators in the host crystals, to find new compositions that would suit phosphor applications. Particular focus was given to the Si-rich region. This led to the synthesis of a single-phase compound that showed an unknown X-ray diffraction pattern. This compound had a composition close to that of SrSi2S5. When this compound is activated with Eu2+ (SrSi2S5:Eu2+), it shows a cyan-blue emission with a main luminescence peak at 495 nm. This emission is excited by wavelengths of 250-440 nm and has a maximum excitation at 350 nm.
Synthesis and Luminescence Properties of a Cyan-blue Thiosilicate-based Phosphor $SrSi_2S_5:Eu^{2+}$
Nakamuraa, Masayoshi,Katoa, Hideki,Takatsuka, Yuji,Petrykinc, Valery,Tezuka, Satoko,Kakihana, Masato The Korean Infomation Display Society 2010 Journal of information display Vol.11 No.4
A series of Sr-Si-S compounds was synthesized using an advanced chemical method in which the use of one solution-based process uniformly dispersed the $Eu^{2+}$ activators in the host crystals, to find new compositions that would suit phosphor applications. Particular focus was given to the Si-rich region. This led to the synthesis of a single-phase compound that showed an unknown X-ray diffraction pattern. This compound had a composition close to that of $SrSi_2S_5$. When this compound is activated with $Eu^{2+}$ ($SrSi_2S_5:Eu^{2+}$), it shows a cyan-blue emission with a main luminescence peak at 495 nm. This emission is excited by wavelengths of 250-440 nm and has a maximum excitation at 350 nm.
Choi, Seung Hee,Kwon, Seok Bin,Humayoun, Usama Bin,Park, Won Kyu,Toda, Kenji,Kakihana, Masato,Masaki, Takaki,Yang, Woo Seok,Song, Young Hyun,Yoon, Dae Ho Elsevier 2018 Dyes and pigments Vol.148 No.-
<P><B>Abstract</B></P> <P>By co-doping the P<SUP>5+</SUP> ions into Ba<SUB>3</SUB>SiO<SUB>5</SUB>:Eu<SUP>2+</SUP>, we synthesized new orange persistent phosphor using cellulose assisted liquid phase precursor (LPP) method. The emission spectra showed a typically broad orange emission band centered at 575 nm attributed to the 4f<SUP>6</SUP>5d<SUP>1</SUP> → 4f<SUP>7</SUP> transition of Eu<SUP>2+</SUP> ions under 400 nm excitation source. The persistent luminescence property of Eu<SUP>2+</SUP> doped Ba<SUB>3</SUB>SiO<SUB>5</SUB> orange phosphor was enhanced by co-doping non-equivalent phosphorus ions into silicon sites. This enhancement can be explained by formation of the trapping center due to the charge compenstation. Consequently, the afterglow decay exhibited an orange emission for more than 5 min after irradiation at under 365 nm for 1 min.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ba<SUB>3</SUB>SiO<SUB>5</SUB>:Eu<SUP>2+</SUP>,P<SUP>5+</SUP> new orange persistent phosphor synthesized using cellulose assisted liquid phase precursor method. </LI> <LI> P<SUP>5+</SUP> doping can improve the persistent luminescence property. </LI> <LI> Trap center storing excitation energy is proposed by charge compensation. </LI> </UL> </P>