Laser treatment on electrophoretically deposited phosphors has been performed as one of the efficient postannealing methods in order to improve the brightness of the phosphor coated on indium-tin oxide-coated glasses. A Nd:YAG continuous wave (lambda = 1064 nm) laser was mainly used as an irradiation source. Two basic parameters, such as laser power and treatment time, were examined inside a high-vacuum chamber. The experimental results presented useful laser-annealing time and enhanced improvement of about 10% in the brightness after the laser irradiation on the phosphor. In addition, another Nd:YAG pulse laser (lambda = 355 nm) was briefly investigated in an effort to reduce any reactive radicals or possibly unnecessary bonding at the phosphor surface through a photodecomposition process. The improvement in the luminescence was thought due to the surface cleaning effect on the phosphor surface.