White Phosphors from a Silicate-Carboxylate Sol-Gel Precursor That Lack Metal Activator Ions
Will H. GreenDepartment of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USAKhoa P. LeDepartment of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USAJonathan GreyDepartment of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USATiffany T. AuDepartment of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USAMichael J. SailorDepartment of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA
1997en
ABI
Аннотация
Highly emissive (with an external quantum yield exceeding 35 percent at a 365-nanometer excitation wavelength) broadband phosphors can be synthesized from a tetraalkoxysilane sol-gel precursor and a variety of organic carboxylic acids. The air-stable phosphors were synthesized at low temperatures (less than 300°C) and displayed broad visible photoluminescence spectra that appeared white to the eye. Water-soluble phosphors can be prepared by the substitution of 3-aminopropyltriethoxysilane for tetraalkoxysilane in the synthesis. These materials are the most efficient extrinsic phosphors that do not contain activator metal ions.
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