A novel way of roughening the surface of a glass substrate using a carbon nanotube-driven template is introduced to enhance the white luminescence characteristics of a printed (Ba,Sr,Ca)2SiO4:Eu2+ yellow silicate phosphor layer. The distribution of closed pores in the template layer induces selective etching and micro-scale roughening. As a result, a substantial improvement of ∼22.5% in the luminous efficacy was achieved when both sides of the substrate were roughened. This is attributed to the reductions of both the total internal reflection of rays at the glass-air interface and the specular reflection at the phosphor-glass interface.