. . "Preble, E." . "Gladkov, Petr" . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "Paskova, T." . "RIV/68378271:_____/12:00395942!RIV14-AV0-68378271" . . "Evans, K. R." . . "Below band-gap optical absorption and photoluminescence excitation spectroscopy at room temperature in low-defect-density bulk GaN:Fe" . "1"^^ . . . "100" . "Applied Physics Letters" . "We present a detailed study of the below band-gap optical absorption at room temperature in bulk semi-insulating GaN:Fe versus the Fe-doping. It was established that the 1.24 eV photoluminescence band at 300\u2009K consists of only vibrational replicas of the Fe3+ 4T1(G) 6A1(S) internal transition. We also studied the below band-gap photoluminescence excitation of the 1.24\u2009eV band. The identical exponential rise of the photoluminescence excitation and the optical absorption coefficient identify the Fe3+/2+ charge-transfer as the main contributor to the 300\u2009K optical absorption in the range 400-500\u2009nm. Practical implications of these results for Fe-doping determination are discussed." . "3"^^ . "0003-6951" . "Below band-gap optical absorption and photoluminescence excitation spectroscopy at room temperature in low-defect-density bulk GaN:Fe"@en . . "10.1063/1.3678195" . "I" . "GaN; spectroscopy; optical absorption"@en . "5"^^ . . "124681" . . "Below band-gap optical absorption and photoluminescence excitation spectroscopy at room temperature in low-defect-density bulk GaN:Fe"@en . . "000299386800022" . . "RIV/68378271:_____/12:00395942" . "3" . "[4EC47F49A33B]" . . . "Below band-gap optical absorption and photoluminescence excitation spectroscopy at room temperature in low-defect-density bulk GaN:Fe" . "Hulicius, Eduard" . "We present a detailed study of the below band-gap optical absorption at room temperature in bulk semi-insulating GaN:Fe versus the Fe-doping. It was established that the 1.24 eV photoluminescence band at 300\u2009K consists of only vibrational replicas of the Fe3+ 4T1(G) 6A1(S) internal transition. We also studied the below band-gap photoluminescence excitation of the 1.24\u2009eV band. The identical exponential rise of the photoluminescence excitation and the optical absorption coefficient identify the Fe3+/2+ charge-transfer as the main contributor to the 300\u2009K optical absorption in the range 400-500\u2009nm. Practical implications of these results for Fe-doping determination are discussed."@en . .