A lactone compound selected from lactone compounds represented by at least one of the following Formula I and Formula II, and wherein Ring-A and Ring-B are each independently selected from unsubstituted aryl, substituted aryl, unsubstituted fused ring aryl, substituted fused ring aryl, unsubstituted heteroaryl, and substituted heteroaryl, m and n are each independently selected from 0 to 4, R 1 for each m, and R 2 for each n, are in each case independently selected from hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, and combinations of two or more thereof; substituted hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, and combinations of two or more thereof; halogen; cyano; and -N(R 11 ')R 12 ', wherein R 11 ' and R 12 ' are each independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, or R 11 ' and R 12 ' together form a ring structure optionally including at least one heteroatom, and R 3 and R 4 are each independently selected from hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, and -N(R 11 ')-where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl; and substituted hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, and -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl; or R 3 and R 4 together form a ring structure optionally including at least one heteroatom. wherein Ring-A and Ring-B are each independently selected from unsubstituted aryl, substituted aryl, unsubstituted fused ring aryl, substituted fused ring aryl, unsubstituted heteroaryl, and substituted heteroaryl, m and n are each independently selected from 0 to 4, R 1 for each m, and R 2 for each n, are in each case independently selected from hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, and combinations of two or more thereof; substituted hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, and combinations of two or more thereof; halogen; cyano; and -N(R 11 ')R 12 ', wherein R 11 ' and R 12 ' are each independently selected from hydrogen, hydrocarbyl or substituted hydrocarbyl, or R 11 ' and R 12 ' together form a ring structure optionally including at least one heteroatom, and R 3 and R 4 are each independently selected from hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, and -N(R 11 ')-where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl; and substituted hydrocarbyl optionally interrupted with at least one of -O-, -S-, -C -, -C O-, -S -, -SO 2 -, and -N(R 11 ')- where R 11 ' is selected from hydrogen, hydrocarbyl or substituted hydrocarbyl; or R 3 and R 4 together form a ring structure optionally including at least one heteroatom.