Chengguo Ming

Turning ultraviolet-green into red light in transparent phosphate glasses for greenhouses

Sb3+/Mn2+ co-doped phosphate glasses were prepared by high temperature melting method. The absorption, excitation, and emission spectra of the glasses were investigated. The glasses are transparent in the visible light region and can emit strong red light under 275, 360, 415, or 520 nm excitation. Under 275 nm excitation, the emission colors of the glasses can vary from blue to red with the increasing of Mn2+ ion concentration. The materials will be helpful in developing glass greenhouse for the green plants.

Highly efficient reddish orange emission in Mn2+/Eu3+ co-doped phosphate glasses for greenhouse

A series of phosphate glasses doped with Mn2+/Eu3+ ions were prepared by high temperature melting method to explore reddish orange luminescent materials for greenhouse. The absorption, emission, and excitation spectra of the samples were studied in detail. A wide excitation band at 300-550 nm in the Mn2+/Eu3+ co-doped phosphate glasses was observed. Under the illumination of sunlight, the Mn2+/Eu3+ co-doped phosphate glasses can emit strong red emission. Our materials will be helpful to improve the utilization of solar for glass greenhouses.

Investigation on Yb3+∕Er3+∕Tm3+ tri-doped phosphate glass ceramic for white-light-emitting diode.

Yb3+∕Er3+∕Tm3+ tri-doped phosphate glass ceramics were prepared by a high-temperature melting method and thermal treatment technology. Upconversion (UC) emissions of the Yb3+∕Er3+∕Tm3+ tri-doped phosphate glass ceramic samples were studied under 975 nm excitation. The glass ceramic samples can simultaneously generate blue, green, and red emissions. The multicolor emission obtained was tuned to white light by adjusting the Er3+ ion concentration. The emission color of the sample doped with 8 mol.% Er3+ ion is white to the naked eye, and CIE coordinates (x=0.316, y=0.354) of the sample are close to the standard equal energy white-light illumination (x=0.333, y=0.333). The material will be useful in developing the white-light-emitting diode.