Journal
ACS NANO
Volume 12, Issue 6, Pages 5359-5367Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00150
Keywords
cluster-mediated nucleation; polymorphism; polymorph-dependent properties; organic laser; optoelectronic devices
Categories
Funding
- Ministry of Science and Technology of China [2017YFA0204503]
- National Natural Science Foundation of China [21503139, 21521062, 21673144]
- Beijing Natural Science Foundation of China [2162011]
- High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [IDHT20180517, CITTCD20180331]
- Youth Innovative Research Team of Capital Normal University
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Controlled fabrication of organic polymorphisms with well-defined dimensions and tunable luminescent properties plays an important role in developing optoelectronic devices, sensors, and biolabeling agents but remains a challenge due to the weak intermolecular interactions among organic molecules. Herein, we developed a two-step solution self-assembly method for the controlled preparation of blue-emissive or green-emissive microribbons (MRs) of difluoroboron avobenzone (BF(2)AVB) by adjusting the cluster-mediated nucleation and subsequent one-dimensional growth processes. We found that blue-emissive MRs belong to the monoclinic phase, in which BF(2)AVB molecules form slipped pi-stacks, resulting in J-aggregates with the solid-state photoluminescence efficiency phi = 68%. Meanwhile, green-emissive MRs are ascribed to the orthorhombic phase and exhibit cofacial, pi-stacks, which lead to H-aggregates with phi = 24%. Furthermore, these as-prepared MRs can both act as polymorph-dependent Fabry-Perot resonators for lasing oscillators. The strategy described here might offer significant promise for the coherent light source of optoelectronic devices.
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