Effective removal of volatile organic compounds (VOCs) in a sealed device: a case study for LED bulbs
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Effective removal of volatile organic compounds (VOCs) in a sealed device: a case study for LED bulbs Calogero Sciascia1, Giovanni Colombo1, Stefano Zilio1, Gianni Santella2, and Alessio Corazza1,* 1 2
SAES Getters S.P.A, viale Italia 77, 20020 Lainate, MI, Italy SAES Getters S.P.A, Nucleo Industriale, 67051 Avezzano, AQ, Italy
Received: 31 August 2020
ABSTRACT
Accepted: 3 November 2020
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.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction In the present paper, we describe a new component, a Getter and Dispenser (GaD) able to contrast the degradation induced by VOCs in hermetically sealed electronic devices. The use of organic materials, such as paints, glues or soldering agents, inside sealed devices can result in the generation of undesired Volatile Organic compounds (VOCs), comprising formaldehyde, benzene, toluene, etc. On the other side, the VOCs precursors can be accidently present as effect of a contamination or
residue of former machining and processing. In this case identifying the quality and the quantity of polluting agents can be a heavy task with several uncertainty factors. Moreover, organic compounds are prone to a plethora of chemical reactions and VOCs can be generated as byproduct of reactions occurring in the operating conditions. VOCs generation is a thermodynamic process, thus the temperature plays a role, being hotter conditions more favorable in creating organic vapors. Another common feature associated to VOCs is the accumulation in closed environment. VOCs generation occurs unless an equilibrium is established or the
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https://doi.org/10.1007/s10854-020-04829-y
J Mater Sci: Mater Electron
generating source has been depleted, but when a good gas exchange is in place, typically VOCs are not harmful or their impact is very limited. Ventilation is, in fact, one of the prescriptions for safe indoor environment [1]. Turning to electronic and optoelectronic devices, that are the main focus of this work, all general descriptions given above still hold, but operative conditi
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