A method for producing a coumarin compound represented by Formula 1, which
comprises a step of reacting a coumarin compound represented by Formula 1
with a compound having an aldehyde group and an activated methylene
group; luminous agents for organic EL elements and organic EL elements
which all comprise the coumarin compound; and displaying panels and
information displaying apparatuses using the organic EL elements: o(Z)m
Formula 1 wherein in Formula 1, o is an aromatic ring, heterocycle, or a
combination thereof, each Z is the same or a different coumarin group
represented by Formula 2; and m is an integer of two or more;
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