In the present work, a series of Mn+ cations (including Ca2+, Sr2+, Ba2+, Li+, Na+, or Al3+) and Mn4+ codoped Mg2TiO4 samples were synthesized through the hydrothermal–calcination route with an aim to explore the crystal structure and luminescence performance in which Mn+ acted as codoped ions. The sites of Mg2+ or Ti4+ were occupied by Mn+, resulting in a variety of coordination environments around Mn4+ ions. Through the methods of experimental characterization and theoretical simulation, the effect of codoping on the lattice structure, electronic structure, and photoluminescence properties was systematically investigated. The emission intensity of the Li/Mn codoped Mg2TiO4 sample was much higher than that of other samples, which is believed to be related to structural symmetry, codoping effect, and its relevant defect chemistry. By crystal microstructure control and ion codoping, the luminescence properties of Mn4+ must have been well regulated and optimized. The finding in this work is meaningful in the luminescence field, which may provide a strategy for developing novel photoluminescent materials.

Measurement of fluorescence lifetime plays an important role in fluorescence lifetime imaging technology. If the Time correlated single photon counting method is used to process the signal of fluorescence lifetime images, it can make the real time imaging which have the virtue of high timing resolve and high signal to noise ratio. Multi-wavelength channels are used to record the lifetime simultaneously in four-dimension TCSPC system design. Four-dimension TCSPC imaging can be used to record the photon density over time, wavelength and coordinates of the scanning area. Analysis shows that the counting efficiency and the amount of information in the data can be increased by recording the fluorescence in several wavelength channels simultaneously. Multi-wavelength imaging was also successfully used to separate different fluorephores in stead-state images.

Paper has been removed due to double publication.

Paper has been removed due to double publication.