A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
One aspect of the present disclosure provides an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains represented by formula (Y,A)3B5O12:Ce. In the optical wavelength conversion member, a (Y,A)3B5O12:Ce crystal grain has a region wherein the A concentration of a peripheral portion of the (Y,A)3B5O12:Ce crystal grain is higher than that of an interior portion of the (Y,A)3B5O12:Ce crystal grain. Thus, the optical wavelength conversion member exhibits high fluorescence intensity (i.e., high emission intensity) and high heat resistance (i.e., low likelihood of temperature quenching). The optical wavelength conversion member has a structure wherein the element A concentration of a peripheral portion of a (Y,A)3B5O12:Ce crystal grain differs from that in an interior portion of the crystal grain. This structure can achieve a ceramic fluorescent body exhibiting superior fluorescent characteristics and superior thermal characteristics with varied colors of emitted light.
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
One aspect of the present disclosure provides an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains represented by formula (Y,A)3B5O12:Ce. In the optical wavelength conversion member, a (Y,A)3B5O12:Ce crystal grain has a region wherein the A concentration of a peripheral portion of the (Y,A)3B5O12:Ce crystal grain is higher than that of an interior portion of the (Y,A)3B5O12:Ce crystal grain. Thus, the optical wavelength conversion member exhibits high fluorescence intensity (i.e., high emission intensity) and high heat resistance (i.e., low likelihood of temperature quenching). The optical wavelength conversion member has a structure wherein the element A concentration of a peripheral portion of a (Y,A)3B5O12:Ce crystal grain differs from that in an interior portion of the crystal grain. This structure can achieve a ceramic fluorescent body exhibiting superior fluorescent characteristics and superior thermal characteristics with varied colors of emitted light.
OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
OPTISCHES WELLENLÄNGENUMWANDLUNGSELEMENT UND LICHTEMITTIERENDE VORRICHTUNG
ÉLÉMENT DE CONVERSION DE LONGUEUR D'ONDE OPTIQUE ET DISPOSITIF ÉLECTROLUMINESCENT
TAKAKU SHOHEI (author) / KATSU YUSUKE (author) / ITO TSUNEYUKI (author) / KURAHASHI TOSHIAKI (author) / YAMADA HIDETO (author)
2024-04-03
Patent
Electronic Resource
English
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OPTICAL WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE
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