Thermoresponsive Persistent Phosphorescent Color Change Using Efficient Thermally Activated Reverse Energy Transfer with a Large Energy Difference
Thermoresponsive Persistent Phosphorescent Color Change Using Efficient Thermally Activated Reverse Energy Transfer with a Large Energy Difference
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DOI：
10.1002/adom.201300013
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发表时间：
2013-04
影响因子：
9
通讯作者：
Kenro Totani;Yuya Okada;S. Hirata;M. Vacha;Toshiyuki Watanabe
中科院分区：
文献类型：
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作者：
Kenro Totani;Yuya Okada;S. Hirata;M. Vacha;Toshiyuki Watanabe
有机发光二极管（OLED），[ 4 ]光动力疗法，[ 5 ]和生物成像。[ 6 ]通常，分子内和分子间的能量转移发生在从较高能量的供体激发态到较低能量的受体激发态，并且与热能无关。[ 7 ]另一方面，在OLED研究中已经报道了从较低能量的激发态到较高能量的激发态的热激活的分子间[ 8-11 ]和分子内[ 12-14 ]反向能量转移（RET）。然而，有效的热活化RET限于在主体-客体材料中具有小能隙（通常为1 μ s）的材料，所述主体-客体材料由作为客体的芳族碳物质和作为主体的无定形留体化合物组成。在该报告中，使用羟基甾体化合物作为具有大量氢键和短π共轭的无定形刚性主体，显著地减少了客体物种的长寿命RT三重态激子通过与主体基质的相互作用而猝灭。
organic light emitting diodes (OLEDs), [ 4 ] photodynamic therapy, [ 5 ] and bioimaging. [ 6 ] Generally, intraand intermolecular energy transfer occurs from a donor excited state of higher energy to an acceptor excited state of lower energy, and is independent of thermal energy. [ 7 ] On the other hand, thermally activated inter[ 8–11 ] and intramolecular [ 12–14 ] reverse energy transfer (RET) from an excited state of lower energy to one that is higher has been reported in OLED research. However, effi cient thermally activated RET is limited to materials with a small energy gap, typically 1 s) in host-guest materials composed of aromatic carbon species as a guest and amorphous steroidal compounds as a host. In the report, the use of hydroxy steroidal compound as an amorphous rigid host with a number of hydrogen bonding and short π -conjugation signifi cantly minimizes quenching of long-lifetime RT triplet excitons of the guest species by interaction with the host matrix