Sr2MgSiO5∶Ce3+的发光性质研究

报道了Sr2MgSiO5∶Ce3+荧光粉的发光性质.

Luminescent Properties of Ce3+-Doped Sr2MgSiO5 Blue-emitting Phosphor

The intense blue emitting phosphors Sr2MgSiO5∶Ce3+ were synthesized by high temperature solid state reaction method, and their luminescence properties were studied. The intense blue-emission band present a peak fixed at 420 nm, which consists of two peaks located at 408 and 445 nm, respectively. The two peaks are originated from the transition 5d→2F5/2(4f) and 5d→2F7/2(4f) of Ce3+ ions. The energy level difference value of the two emission bands is 2 038 cm-1, which is consistent with the theoretic value(2 000 cm-1) between the ground state: 2F5/2 and 2F7/2 of Ce3+ ions. The excitation spectra extend from 250 to 400 nm and the peak positions around 365 nm. In addition, the effect of the concentration of Ce3+ ions and the role of charge compensation of different ions to the emission intense were investigated, the experiment results suggest that when the proportion of Ce3+ ions to Sr2MgSiO5 were 0.03(molar ratio), the strongest emission was obtained. Li+, Na+, K+ and Cl- ions can all enhance the intensity of the emissions; especially Cl- ions gave the best improvement.