Laser direct writing of phosphor screens for high-definition displays

A laser-based forward transfer direct writing technique was used to deposit phosphor powder screens for high-resolution display applications. With thi s technique, called matrix-assisted pulsed-laser evaporation direct write, dense oxide phosphor powders of Y2O3:Eu (red) and Zn2SiO4:Mn (green) were d eposited on alumina and polymer substrates. All processing was performed in air at room temperature. Cathodoluminescent measurements showed that the l uminous efficiency of the phosphor powders was not degraded by the depositi on process. A 6x6 red and green matrix with pixel sizes of 100 mu m (250 li nes per inch) with a 100 mu m spot size is demonstrated; however, with smal ler spot sizes this technique is easily scalable to pixel sizes < 10 mu m ( > 2500 lines per inch). (C) 2000 American Institute of Physics. [S0003-6951 (00)00710-5].