title: Energy/hole transfer phenomena in hybrid α-sexithiophene (α-STH) nanoparticle-CdTe quantum-dot nanocomposites.
abstract: Considerable attention has been paid to hybrid organic-inorganic nanocomposites for designing new optical materials. Herein, we demonstrate the energy and hole transfer of hybrid hole-transporting α-sexithiophene (α-STH) nanoparticle-CdTe quantum dot (QD) nanocomposites using steady-state and time-resolved spectroscopy. Absorption and photoluminescence studies confirm the loss of planarity of the α-sexithiophene molecule due to the formation of polymer nanoparticles. Upon photoexcitation at 370 nm, a nonradiative energy transfer (73 %) occurs from the hole-transporting α-STH nanoparticles to the CdTe nanoparticles with a rate of energy transfer of 6.13×10(9) s(-1). However, photoluminescence quenching of the CdTe QDs in the presence of the hole-transporting α-STH nanoparticles is observed at 490 nm excitation, which is due to both static-quenching and hole-transfer-based dynamic-quenching phenomena. The calculated hole-transporting rate is 7.13×10(7) s(-1) in the presence of 42×10(-8)  M α-STH nanoparticles. Our findings suggest that the interest in α-sexithiophene (α-STH) nanoparticle-CdTe QD hybrid nanocomposites might grow in the coming years because of various potential applications, such as solar cells, optoelectronic devices, and so on.
authors.affiliation: Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata, 700 032, India.
authors.forename: Santanu
authors.initials: S
authors.lastname: Bhattacharyya
authors.forename: Bipattaran
authors.initials: B
authors.lastname: Paramanik
authors.forename: Simanta
authors.initials: S
authors.lastname: Kundu
authors.forename: Amitava
authors.initials: A
authors.lastname: Patra