Near IR to Red Up-Conversion in Tetracene/Pentacene Host/Guest Cocrystals Enhanced by Energy Transfer from Host to Guest

被引：15

作者：

Gatti, Teresa ^{[1
]}

Brambilla, Luigi ^{[1
]}

Tommasini, Matteo ^{[1
]}

Villafiorita-Monteleone, Francesca ^{[2
]}

Botta, Chiara ^{[2
]}

Sarritzu, Valerio ^{[3
]}

Mura, Andrea ^{[3
]}

Bongiovann, Giovanni ^{[3
]}

Del Zoppo, Mirella ^{[1
]}

机构：

[1] Politecn Milan, Dipartimento Chim Mat & Ingn Chim G Natta, I-20133 Milan, Italy

[2] CNR, Ist Studio Macromol, I-20133 Milan, Italy

[3] Univ Cagliari, Dipartimento Fis, SLACS INFM CNR, I-09042 Cagliari, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 31期

关键词：

TRIPLET-TRIPLET ANNIHILATION; LOW-POWER; LUMINESCENT; PENTACENE; CRYSTALS; FISSION; EXCITON; DONOR;

D O I：

10.1021/acs.jpcc.5b01909

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Solid-state materials with up-conversion activity at low power excitation are highly desirable for several optoelectronic applications. In this work we show that a host/guest cocrystal of tetracene/pentacene (Tc/Pc) exhibits a near-infrared (NIR) excited up-conversion process. Forster resonant energy transfer (FRET) from Tc to Pc is enhanced by NIR excitation with respect to visible excitation. A triplet triplet annihilation mechanism activated by the pentacene molecules acting as traps in the host crystal is proposed and confirmed by time-resolved fluorescence spectra. TDDFT calculations on model molecular clusters support this hypothesis, highlighting the existence of strong excitonic interactions which is a necessary prerequisite for good transport Of photogenerated excitons in Pc-doped Tc crystals.

引用

页码：17495 / 17501

页数：7

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