About: http://webisa.webdatacommons.org/158247936

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In particular, EL materials are easily degraded by impurities such as oxygen and water, and therefore it is effective to perform heat treatment within a vacuum before evaporation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au