Visible–Near-Infrared Range Whispering Gallery Resonance from Photonic μ‑Sphere Cavities Self-Assembled from a Blend of Polystyrene and Poly[4,7-bis(3-octylthiophene-2-yl)benzothiadiazole-co-2,6-bis(pyrazolyl)pyridine] Coordinated to Tb(acac)3

A novel red emitting copolymer (P1) was prepared (M n ∼ 10.7 kDa) by copolymerizing tridentate ligand, namely 2,6-bis­(pyrazolyl)­pyridine (BPP) with 4,7-bis­(2-ethynyl-5-thienyl)-2,1,3-benzothiadiazole. This copolymer readily formed an orange yellow emitting metal containing conjugated polymer (P1....

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Published in:ACS applied materials & interfaces 2016-01, Vol.8 (1), p.952-958
Main Authors: Narayana, Yemineni S. L. V, Venkatakrishnarao, Dasari, Biswas, Arani, Mohiddon, Mahamad Ahamad, Viswanathan, Nirmal, Chandrasekar, Rajadurai
Format: Article
Language:English
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Summary:A novel red emitting copolymer (P1) was prepared (M n ∼ 10.7 kDa) by copolymerizing tridentate ligand, namely 2,6-bis­(pyrazolyl)­pyridine (BPP) with 4,7-bis­(2-ethynyl-5-thienyl)-2,1,3-benzothiadiazole. This copolymer readily formed an orange yellow emitting metal containing conjugated polymer (P1.Tb) with Tb­(acac)3. Further, a judicial blend of P1.Tb with polystyrene and its subsequent self-assembly in THF/water produced microspheres with smooth surface area. Interestingly, continuous wave laser excitation of a single microsphere displayed whispering-gallery-mode (WGM) resonance modes over a broad wavelength range covering visible (Vis) and near-infrared (NIR) regions (0.550–0.875 μm). The estimated Q factor was up to 700, which is very high for a metal containing conjugated polymer (MCCP)-based optical gain medium.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.5b10710