Effects Of Reducing Agent On Photoluminescence Properties Of Copper Ion Doped Alkali Borosilicate Phase-Separated Glsses

The Cu+ clusters containing sodium-borosilicate phase-separated glasses were prepared by addition of SnO as a reducing agent. The effects of the amount of SnO on the formation of Cu+ clusters and photoluminescence (PL) properties were investigated. The obtained glasses showed the yellow PL owing to Cu+ clusters and its colour coordinates were close to that of an incandescent lamp. By increasing the additive amount of SnO, the absorption due to Cu2+ clusters increased, however, the excess increase of Cu+ clusters resulted in the saturation of the yellow PL intensity because of the decrease of the penetration depth of the excitation light.