Luminescent Properties and Decay Characteristics of CaS: Mn2+ Phosphor

Mn2+ has been synthesized by a new sulfurizing flux method, and the phosphors prepared in this way is relatively stable in water. The fluorescent spectra of CaS host and CaS: Mn2+ have been measured at room temperature. The luminescent centers formed by O2- ions may be responsible for the host’s blue - green emission. The complete disappearance of this emission in CaS: Mn2+ system confirms that there exists efficient energy transfer from the host to the Mn2+ centers. The decay characteristics have been performed. The photoluminescence decay of CaS: Mn2+ consists of slow and fast components due to the single and paired Mn2+ centers, respectively.