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Tuning exciton delocalization in organic crystalline thin films
Author(s): Kim-Ngan Hua; Lane Manning; Naveen Rawat; Victoria S. Ainsworth; Libin Liang; Madalina Furis
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Paper Abstract

Organic electronics have been drawing a lot of attention over the past few decades with recent commercial applications such as organic photovoltaics, OLEDs, and flexible organic displays. One of the key components for designing organic molecules suitable for electronic devices is a fundamental understanding of excitonic behaviors. Here we report on the fabrication and photoluminescence studies of crystalline thin film organic alloy systems, metal free and metal based octabutoxyphthalocyanine (MOBPcxH2OBPc1-x), and metal-free H2OBPc and octabutoxynapthalocyanine (H2OBNc) mixtures (H2OBNcxH2OBPc1-x). Crystalline thin films of these materials were deposited using an in-house developed pen writing technique that results in macroscopic long-range order even at the ratio of x = 0.5, which is unique and important for spectroscopic studies.

Our experiments reveal that the coherent excitonic states of MOBPcxH2OBPc1-x and H2OBNcxH2OBPc1-x crystalline thin films can be tuned continuously as a function of alloy concentration (0 < x < 1). Moreover, the solution-processed technique used to fabricate these crystalline thin films provides us an unprecedented advantage in designing and controlling the bandgap tunability as well as achieving the desired exciton coherent length for variety of applications.

Paper Details

Date Published: 23 September 2016
PDF: 9 pages
Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 993907 (23 September 2016); doi: 10.1117/12.2237929
Show Author Affiliations
Kim-Ngan Hua, The Univ. of Vermont (United States)
Lane Manning, The Univ. of Vermont (United States)
Naveen Rawat, The Univ. of Vermont (United States)
Victoria S. Ainsworth, The Univ. of Vermont (United States)
Libin Liang, The Univ. of Vermont (United States)
Madalina Furis, The Univ. of Vermont (United States)


Published in SPIE Proceedings Vol. 9939:
Light Manipulating Organic Materials and Devices III
Joy E. Haley; Jon A. Schuller; Manfred Eich; Jean-Michel Nunzi, Editor(s)

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