OPTICAL OXYGEN SENSING MATERIALS BASED ON THE ROOM-TEMPERATURE PHOSPHORESCENCE INTENSITY QUENCHING OF IMMOBILIZED ERYTHROSIN-B

The organic dye, Erythrosin B, exhibits strong room-temperature phosphorescence (RTP) when adsorbed on non-ionic resins or when encapsulated in silicone robber films. In this paper, oxygen transducers based on the RTP intensity quenching of the immobilized dye (on Amberlite XAD-2 or embedded in silicone) have been optically and analytically characterized using continuous and gas-phase flow injection systems. The sensing phases proved to have good photochemical stability. Detection limits of 0.0005% of oxygen in dry argon were found and s(r) values of around 0.3% (at 0.02% oxygen level) were achieved, Typical response times were less than 2 s for full signal change and no hysteresis in the response was observed.