{'fraction_non_alphanumeric': 0.037199124726477024, 'fraction_numerical': 0.045951859956236324, 'mean_word_length': 4.7974683544303796, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Erbium photoluminescence in sol-gel-derived titanium dioxide films

Titanium dioxide films doped with erbium were prepared by sol-gel technique from Ti(OC2H5)4 or Ti(OC4H9)4 precursors. Room-temperature luminescence at 1.53 micrometers associated with 4I13/2 - 4I15/2 transitions of Er3+ ions in TiO2 films derived from the first precursor has been detected. The films have a refractive index about 2.4 and may be used in the planar erbium doped waveguides.