Claim: Ching Wan Tang was born on July 20, 1947, and is known for work on organic LED and hetero-junction organic photovoltaic cell.
Evidence: (1947-07-23) July 23, 1947 (age 73)
Yuen Long, British Hong Kong 
Ching Wan Tang (Chinese: 鄧青雲; pinyin: Dèng Qīngyún; born July 23, 1947) is a Hong Kong–American physical chemist.