Laser direct write printing of sensitive and robust light emitting organic molecules

Kattamis, Nicholas T.; McDaniel, Neal D.; Bernhard, Stefan; Arnold, Craig B.

doi:10.1063/1.3098375

Cited by 66 publications

(51 citation statements)

References 23 publications

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“…A technique known as blister-based-laser-induced forward transfer (BB-LIFT), closely related to LIAD, has been introduced and used mainly for depositing nanoparticles or organic molecules in well-defined microscale patterns on substrates [7][8][9][10]. More recently, it has been used to produce beams of nanoparticles for gas phase analysis [6].…”

Section: Introductionmentioning

confidence: 99%

“…This technique has the same advantages as LIAD but allows a more controlled desorption due to the control over the thickness and properties of the intermediate layer. A thin film of metal [6,7,10] or polymer [8,9] (used so far for depositing liquid inks) is deposited on a glass substrate and placed between the transparent substrate and the molecules of interest. The thin film absorbs the laser pulse thereby rapidly deforming into a blister that propels the particles or ink forward in a beam.…”

Section: Introductionmentioning

confidence: 99%

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Laser pulse duration dependence of blister formation on back-radiated Ti thin films for BB-LIFT

et al. 2016

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The influence of the laser pulse duration on the mechanism of blister formation in the particle transfer technique, blister-based laser-induced forward transfer, was investigated. Pulses from a fs Ti:Sapphire laser (120 fs, 800 nm) and from a ns Nd:YAG laser (7 ns, 532 nm) were used to directly compare blister formation on thin titanium films of ca. 300 nm thickness, deposited on glass. The different blister morphologies were compared and contrasted by using optical microscopy and atomic force microscopy. The results provide evidence for different blister formation mechanisms: for fs pulses the mechanism is predominantly ablation at the metal-glass interface accompanied by confined plasma expansion and deformation of the remaining metal film; for ns pulses it is heating accompanied by thermal expansion of the metal film.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser pulse duration dependence of blister formation on back-radiated Ti thin films for BB-LIFT

et al. 2016

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“…2b). Alq 3 is a small molecule and has already been a material of interest for OLED transfer [16]. Our previous investigations into PLEDs have focussed on MEH-PPV (poly[2-methoxy, 5-(2-ethylhexyloxy)-1,4-phenylene vinylene]) [9,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…Many of these breakthroughs used an absorbing intermediate layer, termed the dynamic release layer (DRL). The DRL is often an inorganic thermal absorber, such as titanium [16], or a polymer that breaks down in a photon-induced chemical reaction, such as the class of triazene polymers [17].…”

Section: Introductionmentioning

confidence: 99%

Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

et al. 2011

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Laser-induced forward transfer (LIFT) has been investigated for bilayer transfer material systems: silver/ organic film (Alq 3 or PFO). The LIFT process uses an intermediate dynamic release layer of a triazene polymer. This study focuses on the effect of introducing a controlled donor-receiver substrate gap distance and the effect of doing the transfer at reduced air pressures, whilst varying the fluence up to ∼200 mJ/cm 2 . The gap between 'in-contact' substrates has been measured to be a minimum of 2-3 µm. A linear variation in the gap width from 'in contact' to 40 µm has been achieved by adding a spacer at one side of the substrate-substrate sandwich. At atmospheric pressure, very little transfer is achieved for Alq 3 , although PFO shows some signs of successful doughnut transfer (with a large hole in the middle) in a narrow fluence range, at gaps greater than 20 µm. For the transfer of Ag/PFO bilayers at atmospheric pressure, the addition of a PFO layer onto the receiver substrate improved the transfer enormously at smaller gaps and higher fluences. However, the best transfer results were obtained at reduced pressures where a 100% transfer success rate is obtained within a certain fluence window. The quality of the pixel morphology at less than 100 mbar is much higher than at atmospheric pressure, particularly when the gap width is less than 20 µm. These results show the promise of LIFT for industrial deposition processes where a gap between the substrates will improve the throughput.

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“…This problem has been typically solved in LIFT through the intercalation of an absorbing solid layer between the transparent donor substrate and the liquid film. In this scheme, the laser radiation is absorbed in the intermediate layer, which is either ablated [9][10][11][12][13][14][15][16][17], or deformed [18,19] by the action of the laser pulse, thus providing the required thrust to propel some liquid away from the donor substrate. Most of the work devoted to the LIFT of liquids has been carried out through the use of absorbing layers.…”

Section: Introductionmentioning

confidence: 99%

Film-free laser forward printing of transparent and weakly absorbing liquids

et al. 2010

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A laser-based technique for printing transparent and weakly absorbing liquids is developed. Its principle of operation relies in the tight focusing of short laser pulses inside the liquid and close to its free surface, in such a way that the laser radiation is absorbed in a tiny volume around the beam waist, with practically no absorption in any other location along the beam path. If the absorbed energy overcomes the optical breakdown threshold, a cavitation bubble is generated, and its expansion results in the propulsion of a small fraction of liquid which can be collected on a substrate, leading to the printing of a microdroplet for each laser pulse. The technique does not require the preparation of the liquid in thin film form, and its forward mode of operation imposes no restriction concerning the optical properties of the substrate. These characteristics make it well suited for printing a wide variety of materials of interest in diverse applications. We demonstrate that the film-free laser forward printing technique is capable of printing microdroplets with good resolution, reproducibility and control, and analyze the influence of the main process parameter, laser pulse energy. The mechanisms of liquid printing are also investigated: timeresolved imaging provides a clear picture of the dynamics of liquid transfer which allows understanding the main features observed in the printed droplets.

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Laser direct write printing of sensitive and robust light emitting organic molecules

Cited by 66 publications

References 23 publications

Laser pulse duration dependence of blister formation on back-radiated Ti thin films for BB-LIFT

Laser pulse duration dependence of blister formation on back-radiated Ti thin films for BB-LIFT

Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

Film-free laser forward printing of transparent and weakly absorbing liquids

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