Patent ID: 8182774

Claim:
A manufacturing method of a nanosized EuSe crystal, the method comprising: heating an Eu(III) complex in a temperature range of equal to or more than 100° C. to be decomposed to generate an Eu(II) ion and an Se ion; and binding the Eu(II) ion and the Se ion to obtain a nanosized EuSe crystal having a particle size corresponding to a heating condition, wherein the Eu(III) complex is represented by a following general formula: where n represents 1, 2, 3 or 4; X is selected from an oxygen atom, a sulfur atom, a selenium atom, and a tellurium atom; and R 1 and R 2 are identical or different, and are selected from aromatic groups, derivatives of aromatic groups, C 1 -C 20 alkyl groups with saturated or unsaturated bonds, derivatives of C 1 -C 20 alkyl groups with saturated or unsaturated bonds, a hydroxyl group, a nitro group, an amino group, a sulfonyl group, a cyano group, a silyl group, a phosphonic acid group, a diazo group, a mercapto group, and halogen atoms.