Xu was born in
Linyi County (now Linyi),
Shandong, on 23 April 1922. He attended Confucius Temple School (). After the outbreak of the
Second Sino-Japanese War, he escaped to
central China's
Hubei province, where he studied at Yunyang National Shandong Middle School (), then fled to
southwest China's
Sichuan province, and studied in Mianyang National No. 6 High School (now Mianyang Nanshan High School; ). In 1941, he was admitted to
National Southwestern Associated University, majoring in
physics. After graduating in 1945, he became an assistant at
Peking University and was a graduate student under the supervision of
Rao Yutai. In 1950, he was transferred to the Institute of Physics of the
Chinese Academy of Sciences to engage in solid-state luminescence research. One year later, he was sent to study at the
Lebedev Physical Institute, earning his vice-doctorate degree in 1955. In September 1965, adjusted by the Chinese Academy of Sciences,
Changchun Institute of Optics, Fine Mechanics and Physics was established with luminescence as its main research direction. In 1966, Xu was assigned to the institute, where he was promoted to director in 1978 and honorary director after 1985. In 1980, Xu, together with Xu Shaohong (), Wu Boxuan () and others, jointly founded the Luminescence Branch Society of the
Chinese Physical Society and served as its first president. In 1987, he moved to Tianjin Institute of Technology (now
Tianjin University of Technology), where he established the Institute of Material Physics as director. In 1997, he joined the faculty of
Northern Jiaotong University (now Beijing Jiaotong University) and established the research base of Luminescence, the Institute of Optoelectronic Technology. On 12 July 2022, Xu died from an illness in
Beijing, at the age of 100. ==Honours and awards==