Phosphine precursor for preparing quantum dot and quantum dot prepared therefrom

A method for preparing a phosphine precursor represented by the following Chemical Formula 1, comprising the steps of:

• preparing a mixture of (i) a primary phosphine compound having the formula Q1PH2 or a secondary phosphine compound having the formula Q1Q2PH, (ii) an ether solvent, and (iii) alkyl lithium;
• and
• adding a silyl halide compound to the mixture:
• in the Chemical Formula 1,
• Q1 is
• Q2 iS
• Q3 is
• wherein R1 to R9 are identical to or different from each other, and each independently, C1-20 linear or branched alkyl, C6-30 aryl, C7-30 alkylaryl, or C7-30 arylalkyl, and
• wherein at least one pair selected from the group consisting of (i) Q1 and Q2, (ii) Q1 and Q3, and (iii) Q2 and Q3 are different from each other.