Facile synthesis of Ca0.68Si9Al3(ON)16:Eu2+ microbelts mat with the enhanced fluorescence and mechanical performance

• Ca0.68Si9Al3(ON)16:Eu2+ microbelts mats were synthesized by electrospinning method.
• The optimum doping concentration of Eu2+ ion is 0.1 mole.
• The microbelts mats show strong yellow emission at 580 nm.
• The Ca0.68Si9Al3(ON)16:Eu2+ mat had the bending strength about 4.5 Mp.
• Different color temperatures could be turned with different thicknesses of the mats.

Yellow-emitting phosphor mat consisting of Ca0.68Si9Al3(ON)16:Eu2+ microbelts was prepared by electrospinning and subsequent nitridation. The as-prepared fiber precursor is smooth and uniform with diameter of 800 to 900 nm. After removing organic templates and nitridation, the morphology of the fiber is well retained and thus a smooth microbelts phosphor mat was obtained. X-ray diffraction and the photoluminescence (PL) spectra reveals that a relatively pure Ca0.68Si9Al3(ON)16 phase and the highest spectral intensity could be obtained at a relatively low temperature of 1500 °C and Eu2+ doping molar concentration of 0.1. The excitation spectra exhibits a broad band, ranging from 300 to 550 nm, which could be excited by blue LED chip at room temperature. The emission spectra of all exhibits a single broad band in the 400 to 700 nm region, with the maximum intensity always being at 580 nm. The Ca0.68Si9Al3(ON)16:Eu2+ microbelts phosphor mat has the bending strength about 4.5 MPa with a photoluminescence quantum yield as high as 65%. By employing it as yellow phosphor, a high-performance warm white LED could be fabricated with low correlated color temperature (2985 K), high-color-rendering index (Ra=86) and luminous efficacy of 129.5 lm W−1. Different color temperatures also could be tuned by employing microbelts phosphor mats with different thicknesses.

Yellow-emitting phosphor mat consisting of Ca0.68Si9Al3(ON)16:Eu2+ microbelts fibers were prepared by electrospinning the fiber precursor and subsequent nitridation. Because the good mechanical strength it could be utilized to realize LEDs remote packaging. By employing it as yellow phosphor, a high-performance warm white LED could be fabricated. Different color temperatures also could be tuned by employing microbelts phosphor mats with different thicknesses.Figure optionsDownload as PowerPoint slide