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Title: | Synergistic photoluminescence enhancement in conjugated polymer-di-ureasil organic–inorganic composites | Authors: | Willis-Fox, Niamh Marques, Ana Teresa Arlt, Jochen Scherf, Ullrich Carlos, Luís D. Burrows, Hugh Evans, Rachel C. |
Issue Date: | 2015 | Publisher: | Royal Society of Chemistry | Project: | Science Foundation Ireland under Grant No. 12/IP/1608 Irish Research Council - Government of Ireland postgraduate studentship European Commission under the Seventh Framework Programme by means of the grant agreement for the Integrated Infrastructure Initiative No. 262348 European So Matter Infrastructure (ESMI). COST action MP1202 (HINT – Hybrid Interfaces) PEst-OE/QUI/UI0313/2014 project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013) |
Serial title, monograph or event: | Chemical Science | Volume: | 6 | Issue: | 12 | Abstract: | Poly(fluorene) conjugated polyelectrolyte (CPE)-di-ureasil organic–inorganic composites have been prepared using a versatile sol–gel processing method, which enables selective localisation of the CPE within the diureasil matrix. Introduction of the CPE during the sol–gel reaction leads to a homogeneous distribution of the CPE throughout the di-ureasil, whereas a post-synthesis solvent permeation route leads to the formation of a confined layer of the CPE at the di-ureasil surface. The CPE and the di-ureasil both function as photoactive components, contributing directly to, and enhancing the optical properties of their composite material. The bright blue photoluminescence exhibited by CPE-di-ureasils is reminiscent of the parent CPE; however the distinct contribution of the di-ureasil to the steady-state emission profile is also apparent. This is accompanied by a dramatic increase in the photoluminescence quantum yield to >50%, which is a direct consequence of the synergy between the two components. Picosecond time-correlated single photon counting measurements reveal that the di-ureasil effectively isolates the CPE chains, leading to emissive trap sites which have a high radiative probability. Moreover, intimate mixing of the CPE and the di-ureasil, coupled with their strong spectral overlap, results in efficient excitation energy transfer from the di-ureasil to these emissive traps. Given the simple, solution-based fabrication method and the structural tunability of the two components, this approach presents an efficient route to highly desirable CPE-hybrid materials whose optoelectronic properties may be enhanced and tailored for a targeted application. | URI: | https://hdl.handle.net/10316/109088 | ISSN: | 2041-6520 2041-6539 |
DOI: | 10.1039/C5SC02409A | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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