| abstract |
Optical materials with improved heat resistance, especially dopant-type GI POFs with improved heat resistance are provided. These optical materials each comprises at least one aromatic sulfide compound represented by the following formula (1): n n n wherein n n stands for an integer of from 2 to 12, n k stands for an integer of from 1 to n, n A represents a substituted or unsubstituted, n-valent carbocyclic aromatic ring or heterocyclic aromatic ring, and n B 1 to B n each independently represent a substituted or unsubstituted, carbocyclic aromatic group or heterocyclic aromatic group. |