Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film.

Autor: Virgili T; IFN-CNR, c/o Dipartimento di Fisica, Politecnico di Milano, P.zza Leonardo Da Vinci 32, 20132 Milano, Italy., Anni M; Dipartimento di Matematica e Fisica 'Ennio De Giorgi', Università del Salento, via per Arnesano 73100 Lecce, Italy., Giorgi ML; Dipartimento di Matematica e Fisica 'Ennio De Giorgi', Università del Salento, via per Arnesano 73100 Lecce, Italy., Varillas RB; IFN-CNR, c/o Dipartimento di Fisica, Politecnico di Milano, P.zza Leonardo Da Vinci 32, 20132 Milano, Italy., Squeo BM; SCITEC-CNR, Via Corti 12, 20133 Milano, Italy., Pasini M; SCITEC-CNR, Via Corti 12, 20133 Milano, Italy.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2019 Dec 24; Vol. 25 (1). Date of Electronic Publication: 2019 Dec 24.
DOI: 10.3390/molecules25010079
Abstrakt: The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10 -16 cm 2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm -2 and 21 μJcm -2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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