Mixed solvent for quantum dot ink composition, quantum dot ink composition including the same, light-emitting device manufactured using quantum dot ink composition, and electronic apparatus including the light-emitting device

A mixed solvent for a quantum dot ink composition, the mixed solvent comprising:

• at least two solvents, wherein
• an R1 value of the mixed solvent is greater than or equal to about 7.3 Mpa0.5,
• an R2 value of the mixed solvent is greater than or equal to about 5.0 Mpa0.5,
• a molar volume of the mixed solvent is greater than or equal to about 160 cm3/mol,
• the mixed solvent comprises a first solvent and a solvent Z,
• an amount of the first solvent is greater than about 97 wt % and less than or equal to about 99 wt % based on 100 wt % of the mixed solvent,
• an amount of the solvent Z is greater than about 1 wt % and less than or equal to about 7 wt % based on 100 wt % of the mixed solvent,
• R
• 1
• 2
• =
• 4
• ⁢
• (
• dD
• -
• 19.7
• )
• 2
• +
• (
• dP
• -
• 8.4
• )
• 2
• ⁢
• (
• dH
• -
• 9.
• )
• 2
• ,
• R
• 2
• 2
• =
• 4
• ⁢
• (
• dD
• -
• 17.2
• )
• 2
• +
• dP
• 2
• +
• (
• dH
• -
• 1.5
• )
• 2
• ,
• dD indicates a dispersion component of Hansen parameters for each of the at least two solvents,
• dP indicates a polar component of the Hansen parameters for each of the at least two solvents,
• dH indicates a hydrogen-bonding component of the Hansen parameters for each of the at least two solvents,
• wherein, for the mixed solvent, the dD, dP, and dH used in the foregoing R12 and R22 expressions are mixture-averaged Hansen parameters computed as wt %-weighted sums of the component solvents' respective parameters, and wherein R1 and R2 are the principal square roots of the foregoing R12 and R22 expressions,
• the R1 value and the R2 value of the mixed solvent are each calculated by adding values obtained by multiplying dD, dP, and dH of each of the at least two solvents respectively by wt % ratio of the at least two solvents, and
• the molar volume of the mixed solvent is calculated by adding values obtained by multiplying a molar volume of each of the at least two solvents respectively by the wt % ratio of the at least two solvents,
• wherein Mpa0.5 is a unit of the Hansen parameters.