Answer:
Zinc
oxide (ZnO) crystals upon heating decompose as follows:
\[ZnO\,Z{{n}^{2+}}(s)+1/2\,{{O}_{2}}(g)+2{{e}^{-}}\]
The excess of \[Z{{n}^{2+}}\] ions
formed are trapped in the interstitial spaces and the electrons are also
trapped in the neighbourhood. These electrons absorb radiations corresponding
to certain specific colour from the light and emit yellow light.
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