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| However, solvent polarity exerted a great effect on the PL emission, as shown in Fig. 5 and Table 2. The PL intensities (I) and quantum yield (F) of the solutions of the three compounds decreased with increasing solvent polarity. TheFof1B-TPA, 2B-TPAand3B-TPAwere 0.57, 0.67 and 0.73 in CH (lowest polarity, theFwere very high), and 0.19, 0.20 and 0.20 in DMSO (highest polarity), respectively. In CH, theFwere approximately 3.0-, 3.4-, and 3.7-fold higher as compared with those in the DMSO. As illustrated in Fig. 5, the maximum emission wave-length (l) of each compound progressively shifted to a longer wavelength when the polarity of the solvent increased from CH to DMSO. |
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| 然而,如图5所示和表2所示,溶剂的极性对PL发光具有很大影响。PL强度(I)和三种化合物溶液的量子效率(F),随着溶剂的极性降低以增加。1B-TPA,2B-TPA和3B-TPA的F在CH(极性最低,F非常高)中分别为0.57,0.67和0.73的,而在DMSO(极性最高)中分别为0.19,0.20和0.20。F在CH中分别是在DMSO中的约为3.0-,3.4-,和3.7-倍。如图5所示,当所用溶剂的极性由CH提高到DMSO时,各化合物的最大发光波长(l)向更长波长逐渐迁移。 |
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