Radiation-induced damage and recovery effects in GG17 glass irradiated by 1MeV electrons

Radiation Testing of Optical and Semiconductor Components for Radiation-Tolerant LED Luminaires

“…Before irradiation, transmittance of BS is >90% (see Fig. 2a) until the UV cut-off edge at 335 nm [13], [14]. Upon increasing dose, two strong absorption bands located near 330 nm and 475 nm appear; these bands have been previously attributed to boron oxygen hole centres [15] (each centre is given by a hole trapped on a bridge oxygen structure with [BO 4 ] − ).…”

“…radiation-induced defects originating these bands can be thermally annealed); in particular, previous experiments have shown that recovery of transmission at radiation-induced bands occurs even at room temperature. For more details on thermal annealing at room temperature in air of borosilicate, we defer to [13], [29]; for quartz, we defer to [30] and references therein; for PMMA and PC, we make reference to [23], [31]. In addition, radiation-induced absorption bands in these materials can also be optically bleached: absorption bands at 210 nm and 300 nm in γ-ray irradiated FQ are known to photobleach under UV light [21]; visible light can bleach radiation-induced absorption bands in both BS [32], [33] and PC [34], [35]; optical bleaching of PMMA presents a more complex behaviour, exhibiting a reduction or an enhancement of the radiation-induced absorption in the UV spectrum depending on the emission wavelength of the light source used for bleaching [36].…”