Naphthalimide sulfonate derivative, and photoacid generator and photoresist composition each comprising same

A sulfonic acid derivative compound of naphthalimide represented by the following Formula I:

• wherein
• R1 and R2 are each independently a substituted or unsubstituted aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, a substituted or unsubstituted arylalkyl group, or a substituted or unsubstituted alkylaryl group;
• and
• R3 is independently a substituted or unsubstituted aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, a substituted or unsubstituted arylalkyl group, a substituted or unsubstituted alkylaryl group, or a group of formula R4—O—(CH2)n—, where n is an integer of 1 to 12 and R4 is a substituted or unsubstituted aliphatic hydrocarbon group.