Effective removal of volatile organic compounds (VOCs) in a sealed device: a case study for LED bulbs

It is known that Volatile Organic Compounds (VOCs) can be generated by components in electronic devices during their operative service life with consequent detrimental effects. In particular, for opto-electronic devices such as sealed LED lamps and laser diodes where an intense optical flux is in place, it was already reported the appearance of dark spots onto emitting area as effect of pyrolysis of carbonaceous gaseous species within the package. In the present paper we present a novel solution to contrast VOCs-induced degradation in hermetically sealed devices, based on a proprietary composition that combines positive and synergic effects of both Getter and Dispenser (GaD) materials. In particular, we describe the fundamental action mechanisms and the criteria for GaD design. We demonstrate GaD effectiveness in a real operating system, extending the effective service life from few hundred hours to several thousand hours.