Effect of composition and synthesis route on structure and luminescence of NaBaPO&lt;sub&gt;4&lt;/sub&gt;:Eu&lt;sup&gt;2+&lt;/sup&gt; and ZnAl&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;:Eu&lt;sup&gt;3+&lt;/sup&gt;
JJAP conference proceedings