IPA: /ˌfoʊtəʊɪˈmɪsɪv/
KK: /ˌfoʊtoʊɪˈmɪsɪv/
Relating to the process where light causes the emission of electrons from a material.
The photoemissive properties of the material make it suitable for use in light sensors.
Photoemissive → It is formed from "photo-" (from Greek "phōs", meaning light) and "emissive" (from Latin "emittere", meaning to send out). The word describes a property of materials that emit electrons when exposed to light.
Think of 'light' ('photo-') causing something to 'send out' ('emissive') electrons — that's what photoemissive means.
No commonly confused words.