In:
Advanced Functional Materials, Wiley, Vol. 28, No. 46 ( 2018-11)
Abstract:
The aggregation of chalcogenopyrylium‐terminated heptamethine dyes in high‐chromophore density films can be substantially suppressed by attachment of rigid, bulky substituents that project out of the plane of the conjugated π‐system of the dye, allowing the retention in the solid state of favorable linear and nonlinear optical properties relevant to all‐optical signal processing (AOSP). Dye structures are systematically engineered with a range of out‐of‐plane substituents to investigate the impacts on the optical properties at 1550 nm in the solid state. Large magnitudes of the third‐order susceptibility are obtained for solid films. Very high values of the two‐photon figure‐of‐merit (2PA‐FOM), an important parameter for AOSP, are observed in dilute solutions of seleno‐ and telluropyrylium dyes (in several cases 〉 30). In the case of the telluropyrylium dye, the 2PA‐FOM is not measureable for 50 wt% blends with polymers. Blends of the selenopyrylium examples exhibit 2PA‐FOM values that, although decreased substantially relative to the solution values, in some cases meet the requirements for AOSP.
Type of Medium:
Online Resource
ISSN:
1616-301X
,
1616-3028
DOI:
10.1002/adfm.201804073
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2029061-5
detail.hit.zdb_id:
2039420-2
SSG:
11
Bookmarklink