ABSTRACT
INTRODUCTION Glass coatings of metal oxides have been used in fluorescent lamps to reduce Hg consumption [1].
However, some impurities on the surface of the metal oxide may also be carried into the lamps. It has been studied that the effects of the gas impurities in fluorescent lamps [2]. As for residual hydroxyl groups adsorbed on alumina, the influence of photolytic dehydration on lamp characteristics was reported [3]. Many works have been made on infrared analysis of 7-alumina. J.B. Peri found that the surface of 7-alumina covered in 10% hydroxyl group remains and five isolated hydroxyl bands appear at over 700°C [4]. N.D. Parkyns explained that the absorption spectrum of CO2 is affected by the residual hydroxyl group. Due to the difference in the experimental conditions [5], it is difficult that these results can be applied to the fluorescent lamps immediately.
