Patent ID: 6924233

Claim:
A method for coating a semiconductor device, the semiconductor device having a p side and an n side, the method comprising: a) providing a bath containing suspended particles, the suspended particles comprising particles of a first phosphor material and particles of a second phosphor material, the particles of the first phosphor material having a mean particle size in the range from about 1 micron to about 6 microns, the particles of the second phosphor material having a mean particle size in the range from about 12 microns to about 25 microns, wherein the particle size distribution of the phosphor material in the bath is bimodal, b) positioning a semiconductor device in the bath, c) applying a first biasing voltage between an anode in electrical contact with the bath and the p side to hold the anode at a positive voltage with respect to the p side, d) applying a second biasing voltage between the p side and the n side.