Abstract
The disposal of long-wavelength-emitting sources is of paramount relevance in technology and biophotonics due to the low interference with the surroundings that these kinds of far-red and near-infrared radiations hold. As a result of the continued efforts carried out during the last few years by our research group to design new boron-dipyrromethene (BODIPY) dyes with improved photonic performance, two approaches were tested to develop a new generation of organic dyes able to display efficient and long-lasting laser emission in both target spectral regions. On the one hand, the annulation of aromatic benzofuran at the dipyrrin backbone leads to conformationally restricted dyes yielding photostable and bright laser emission beyond 600 nm at the far-red spectral region. On the other hand, a more pronounced shift to longer wavelengths reaching 725 nm at the near-infrared region is feasible, while keeping a reasonably high laser efficiency and tolerance to prolonged and intense pumping, based on aza-BODIPYs bearing peripheral aryl rings. These two complementary strategies yield a library of laser-emitting compounds comprising the 600–725 nm spectral region. Moreover, their laser performance is better than the commercially available dye lasers active in this spectral window.
Highlights
The design of stable and bright photoactive systems able to emit in the far-red and especially in the near-infrared (NIR, beyond 700 nm) spectral regions is an actively sought task in photonics [1,2,3,4,5,6]. This kind of long-wavelength emission is an attractive radiation source for telecommunications, as well as for optics and electronics [7,8,9,10], owing to its low background interference with the surroundings which allows the light to travel long distances. They are appealing as photosensitizers for solar cells because thegap between the highest occupied molecular orbital (HOMO)
The laser laserdyes dyesdesigned designed cover far-red region the visible spectrum areonbased on a core bearing fused benzofuran rings with different substitution patterns
To induce a more pronounced shiftwhile of the laser emission to longer lasting emission efficiency typical of the BODIPYs pushing it into the far-red edgewavelengths, of the visible we focused on lasting emission typical of the BODIPYs it into the far-red edge of the visible spectrum
Summary
Edurne Avellanal-Zaballa 1 , Leire Gartzia-Rivero 1 , Jorge Bañuelos 1, * , Inmaculada García-Moreno 2 , Antonia R. Agarrabeitia 3 , Eduardo Peña-Cabrera 4 and Maria Jose Ortiz 3. Received: 17 August 2020; Accepted: 4 September 2020; Published: 7 September 2020. Featured Application: Organic lasers active in the red–near-infrared spectral regions endowed with efficient and long-lasting emission
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