ALEXANDRIA, Va., May 12 -- United States Patent no. 12,628,557, issued on May 12, was assigned to DuPont Specialty Materials Korea Ltd. (South Korea).

"Plurality of host materials and organic electroluminescent device comprising the same" was invented by Hyo-Soon Park (Gyeonggi-do, South Korea), Joon-Hyung Kil (Gyeonggi-do, South Korea), Kyoung-Jin Park (Gyeonggi-do, South Korea), Sang-Hee Cho (Gyeonggi-do, South Korea) and So-Mi Park (Gyeonggi-do, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a plurality of host materials comprising at least one first host compound and at least one second host compound, and an organic electroluminescent device comprising the sa...