Journal
ACS MACRO LETTERS
Volume 5, Issue 12, Pages 1301-1305Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.6b00642
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Funding
- Program for Leading Graduate Schools Academy for Co-creative Education of Environment and Energy Science, MEXT, Japan
- Japan Society for the Promotion of Science [15J06206, 25288096]
- Grants-in-Aid for Scientific Research [25288096, 15J06206] Funding Source: KAKEN
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Semiaromatic polyimides (PIs) and imide compounds containing heavy halogens (Br, I) in pyromellitic moieties were designed and synthesized to examine their photoluminescence properties. Solutions of imides and PI films exhibited reddish-color room-temperature phosphorescence (RTP) with very large Stokes shifts (ca. 10000 cm(-1)). In addition, the PI films showed small-Stokes-shifted fluorescence emissions at around 540 nm with absorption bands arising from aggregated PI chains at 400-500 nm. Enhanced phosphorescence observed for the PI films under vacuum indicates that the RTP lifetime is significantly influenced by the triplet triplet energy transfer to atmospheric oxygen. These PIs with very-large-Stokes-shifted RTP are applicable as spectral conversion materials in displays, photovoltaic devices, and crop cultivators, as well as to oxygen/air sensors.
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