CaAl655 Phosphor: Emission Spectrum from Blue LED

Spectrum through hand held spectroscope of a homemade phosphor made by combining aluminum sulfate, calcium chloride and water. This was then heated with a MAPP gas torch which produced this bright red phosphor.

I believe the resulting phosphor is a form of calcium aluminate / alumina containing Mn4+ and Cr3+ impurities.

Emission spectrum was stimulated by 455nm 3W Blue LED bulb.

Emission possibly due to Mn4+ in an octahedral crystal field:
See:
www.nature.com/ncomms/2014/140708/ncomms5312/fig_tab/ncom...

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