The protective coating efficiency of illuminated phosphor micro-particles has been investigated. The coating was performed by a pulsed feeding metal-organic chemical vapor deposition (MOCVD) in a fluidized bed using aluminum tri-sec-butylate or aluminum isopropoxide as a precursor. This pulsed MOCVD process in a fluidized bed shows excellent performance for encapsulating micro-particles. The pulsed feeding and the fluidization minimize the agglomeration between the phosphor micro-particles during the MOCVD process. Coating thickness is also precisely controlled up to the range of a few angstroms in thickness. Furthermore, by feeding the explosive aluminum MO precursor separately with oxygen gas, the coating process has been performed more safely in the pulsed MOCVD process.