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

Virgili, Tersilla; Anni, M.; Giorgi, Maria Luisa De; Borrego-Varillas, Rocío; Squeo, Benedetta Maria; Pasini, Mariacecilia

doi:10.3390/molecules25010079

Cited by 7 publications

(3 citation statements)

References 49 publications

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“…To date, optical gain and optically pumped lasing have been demonstrated in many families of conjugated molecules and with a wide range on different resonators [ 20 , 21 ] and a first indication of lasing effect under electrical pumping has been recently reported [ 22 ]. In particular the organic systems showing optical gain can be divided in the two big families of neat films or blends of active molecules [ 2 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ,…”

Section: Introductionmentioning

confidence: 99%

Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides

2020

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Amplified Spontaneous Emission (ASE) threshold represents a crucial parameter often used to establish if a material is a good candidate for applications to lasers. Even if the ASE properties of conjugated polymers have been widely investigated, the specific literature is characterized by several methods to determine the ASE threshold, making comparison among the obtained values impossible. We quantitatively compare 9 different methods employed in literature to determine the ASE threshold, in order to find out the best candidate to determine the most accurate estimate of it. The experiment has been performed on thin films of an homopolymer, a copolymer and a host:guest polymer blend, namely poly(9,9-dioctylfluorene) (PFO), poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) and F8BT:poly(3- hexylthiophene) (F8BT:rrP3HT), applying the Variable Pump Intensity (VPI) and the Variable Stripe Length (VSL) methods. We demonstrate that, among all the spectral features affected by the presence of ASE, the most sensitive is the spectral linewidth and that the best way to estimate the ASE threshold is to determine the excitation density at the beginning of the line narrowing. We also show that the methods most frequently used in literature always overestimate the threshold up to more than one order of magnitude.

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Section: Introductionmentioning

confidence: 99%

Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides

2020

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“…In recent years, organic semiconductor laser diodes (OSLDs) [ 6 , 7 ] have been intensively studied for the purposes of materials development [ 8 , 9 , 10 ], mechanism investigation, and device optimization [ 11 ]. The use of OSLDs in optoelectronics has many benefits compared to the conventional lasers based on inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric AZA-BODIPY with Optical Gain in the Near-Infrared Region

et al. 2022

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In recent years, there has been a lot of interest in the development of organic compounds emitting in the near-infrared (NIR) region due to their stimulating applications, such as biosensing and light detection and ranging (LiDAR). Moreover, a lot of effort has been devoted to finding organic emitters with optical gain in the NIR region for lasing applications. In this paper, we present the ultrafast spectroscopy of an asymmetric AZA-BODIPY molecule that shows relevant photophysical changes moving from a diluted solution to a concentrated solution and to a spin-coated film. The diluted solution and the spin-coated film show a bleaching band and a stimulated emission band in the visible region, while the very concentrated solution displays a broad (150 nm) and long-living (more than 400 ps) optical gain band in the NIR region, centered at 900 nm. Our results pave the way for a new organic laser system in a near-infrared spectral region.

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“…[12,13] Thus, the fabrication of top-layer polymeric resonator devices operating in the blue and deep-blue regions remains a challenge, firstly because of possible resolution limitations in the resonator fabrication, imposed by the relatively low grating periods required, and secondly, because of the need of efficient laser dyes operating in those regions. [14] With regards to the active laser material, among a wide variety of materials used, carbon-bridged oligo(p-phenylenevinylene)s (COPVn, with n = 1-6), dispersed in polystyrene (PS), used as passive matrix, have demonstrated a great success to be used for DFB lasers because of the rigid planar molecular structure that is advantageous to enhance emission efficiency. [15][16][17] These compounds emit at wavelengths that cover a wide range of the visible spectrum (380-600 nm), where emissions in the blue side correspond to the shorter COPVn, with n = 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

Blue and Deep‐Blue‐Emitting Organic Lasers with Top‐Layer Distributed Feedback Resonators

Bonal

Villalvilla

Quintana

et al. 2020

Advanced Optical Materials

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All‐solution processed surface‐emitting organic distributed feedback lasers are attractive devices for low‐cost applications. Here, lasers emitting in the spectral region between 375 and 475 nm, in which both active material and resonator (1D relief gratings) are based on solution‐processable polymer films, are reported. Ten different organic compounds dispersed in polystyrene are used as active layers of the prepared devices. They include various carbon‐bridged oligo(p‐phenylenevinylene) (COPVn, with n = 1,2) derivatives and two terfluorene compounds. The synthesis and complete optical and amplified spontaneous emission properties of one of the COPV1 compounds, COPV1(Me)‐t‐Bu, designed for deep‐blue emission, are also included. The feasibility of the resonator fabrication, performed by holographic lithography with a dichromated gelatine photoresist over the active film, is successfully demonstrated for all devices. Remarkably, no resolution limitations are found even for the lowest grating period (235 nm) required for the fabrication of the laser based on COPV1(Me)‐t‐Bu. It is also demonstrated that the rectangular grating profile with duty cycle 0.75:0.25 (hill:valley) is very convenient to optimize the resonator efficacy.

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

Cited by 7 publications

References 49 publications

Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides

Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides

Asymmetric AZA-BODIPY with Optical Gain in the Near-Infrared Region

Blue and Deep‐Blue‐Emitting Organic Lasers with Top‐Layer Distributed Feedback Resonators

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