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Charge-transfer state is strongly dependent on the bond length between Eu-O, the longer length, the lower the energy is required for charge-transfer state transition. In this study, Eu3+ was evenly distributed within the glass and participated the ionic O2- and Eu3+ bond formation. Due to its strong electronegativity , it is difficult for electron transfer from ligand O2- to Eu3+, thus it requires a near ultraviolet excitation (280 nm) with higher energy level.
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2Â¥2016-11-22 11:15:30
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³¬¼¶ÀÏ¿ì: ½ð±Ò+30, ¡ï¡ï¡ïºÜÓаïÖú 2016-11-22 11:37:48
µçºÉÇ¨ÒÆÌ¬Ç¿ÁÒ ÒÀÀµÓÚ Eu-O¼ü³¤£¬Ëæ×żü³¤ µÄ±ä»¯£¬¼ü³¤Ô½³¤£¬µçºÉ´«µÝ̬µÄ ÄÜÁ¿Ô½µÍ¡£¶øÔÚ±¾ÊµÑéÖÐ Eu3+Àë×Ó ¾ùÔȵطֲ¼ÓÚ ²£Á§ÄÚ²¿ ²ÎÓëÁË ²£Á§½á¹¹ ×é³É£¬Óë²£Á§ÖÐ ·ÇÇÅÑõ¼üÖÐ µÄO2-Àë×Ó ÐγÉEu3+-O¼ü£¬¶øÑõµÄ µç¸ºÐԽϴó£¬Êܼ¤·¢Ê± µç×Ó´Ó ÅäÌåO2- ×ªÒÆµ½ Eu3+µÄ ÄѶȽϴó£¬ËùÐ輤·¢²¨³¤ ÔÚ ½ü×ÏÍⲨ¶Î µÄ280nm¸½½ü¡£
Charge transfer state is closely related to Eu-O bond length. Specifically the longger the Eu-O bond length is, the lower the charge transfer state energy will be. In this test, Eu3+ was evenly distributed inside of glass, acting as a component of glass structure and coupling with O2- of non-bridging oxygen into Eu3+-O bond. As oxygen has a larger electronegativity, which makes it difficult for excited electronics to transfer from ligand O2 - to  Eu3+, therefore the required excitation wavelength should be located around 280nm of near ultraviolet waveband.
3Â¥2016-11-22 11:24:25
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