Study of hot electrons in AlGaN/GaN HEMTs under RF Class B and Class J operation using electroluminescence. - Tommaso Brazzini; Michael A. Casbon; Huarui Sun; Michael J. Uren; Jonathan Lees; Paul J. Tasker; Helmut Jung; Hervé Blanck; Martin Kuball (Microelectron. Reliab., 2015)