The carbon based boron oxynitride （BCNO） phosphor was synthesized by solid state reaction between boric acid （H3BO3） and melamine （C3H6N6） in the molar ratios of 1：1 and 2：1 respectively at different temperatu...The carbon based boron oxynitride （BCNO） phosphor was synthesized by solid state reaction between boric acid （H3BO3） and melamine （C3H6N6） in the molar ratios of 1：1 and 2：1 respectively at different temperatures up to 1400℃. The composition with molar ratios 1：1 of starting materials is found to be highly crystalline with an average particle size of 38 nm and the lattice constants a=b=0.251 nm and c=0.666 nm. The solid state reaction of boric acid and melamine in the composition 2：1 leads to the formation of compound in the semi-crystalline state under the same conditions of preparation, but its phase cannot be recognised. The X-ray diffraction （XRD） spectra, transmission electron microscopy （TEM） and scanning electron microscopy （SEM） images of BCNO compound confirm the phase, nanometre size and shape respectively of synthesized material. The photoluminescence （PL） spectra of the synthesized BCNO products reveals that the electronic structure of BCNO compound can be controlled by changing the molar ratios of starting materials and heating temperatures. These synthesized compounds are very interesting and important candidate materials for light emitter.展开更多
Yellow-emitting BCNO phosphors,applied for white light-emitting-diodes（LEDs）,were synthesized by a facile microwave heating route at lower temperature within short duration.The prepared BCNO phosphors exhibited amor...Yellow-emitting BCNO phosphors,applied for white light-emitting-diodes（LEDs）,were synthesized by a facile microwave heating route at lower temperature within short duration.The prepared BCNO phosphors exhibited amorphous form and tunable yellow emission in the range of 510–550 nm under the excitation of 450-nm blue light.The effects of carbon content on the photoluminescence properties for these BCNO phosphors and their application performances in white LEDs were investigated in detail.The demonstrated microwave synthesis route is promising in preparing low-cost phosphors,and the prepared BCNO phosphor may find potential application in blue-based white LEDs.展开更多
文摘The carbon based boron oxynitride （BCNO） phosphor was synthesized by solid state reaction between boric acid （H3BO3） and melamine （C3H6N6） in the molar ratios of 1：1 and 2：1 respectively at different temperatures up to 1400℃. The composition with molar ratios 1：1 of starting materials is found to be highly crystalline with an average particle size of 38 nm and the lattice constants a=b=0.251 nm and c=0.666 nm. The solid state reaction of boric acid and melamine in the composition 2：1 leads to the formation of compound in the semi-crystalline state under the same conditions of preparation, but its phase cannot be recognised. The X-ray diffraction （XRD） spectra, transmission electron microscopy （TEM） and scanning electron microscopy （SEM） images of BCNO compound confirm the phase, nanometre size and shape respectively of synthesized material. The photoluminescence （PL） spectra of the synthesized BCNO products reveals that the electronic structure of BCNO compound can be controlled by changing the molar ratios of starting materials and heating temperatures. These synthesized compounds are very interesting and important candidate materials for light emitter.
基金the financial support by the National Natural Science Foundation of China(Nos.50872091and 51102265)Program of Discipline Leader of Colleges and Universities(Tianjin,China)‘‘Foreign Experts’’Thousand Talents Program(Tianjin,China)
文摘Yellow-emitting BCNO phosphors,applied for white light-emitting-diodes（LEDs）,were synthesized by a facile microwave heating route at lower temperature within short duration.The prepared BCNO phosphors exhibited amorphous form and tunable yellow emission in the range of 510–550 nm under the excitation of 450-nm blue light.The effects of carbon content on the photoluminescence properties for these BCNO phosphors and their application performances in white LEDs were investigated in detail.The demonstrated microwave synthesis route is promising in preparing low-cost phosphors,and the prepared BCNO phosphor may find potential application in blue-based white LEDs.
