36.2: <i>Invited Paper</i>: Progress in Laser Induced Thermal Imaging of OLEDs

Wolk, Martin; Lamansky, Sergey; Tolbert, William A.

doi:10.1889/1.3069713

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…Standard solutionbased printing techniques have been well investigated, 10,11 but are "wet" processes that require solvent orthogonality. "Dry" OLED printing techniques using lasers have been developed to overcome these problems, 8,[12][13][14] including LIFT. 4,5 In our modification of the LIFT process, a thin photodecomposable triazene polymer layer (TP) acts as sacrificial "dynamic release layer" (DRL).…”

mentioning

confidence: 99%

Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer

Shaw-Stewart

Lippert

Nagel

et al. 2012

Applied Physics Letters

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An optimized laser-induced forward transfer (LIFT) technique has been used to fabricate tri-color organic light-emitting diode (OLED) pixels. At reduced pressures, and with a defined donor-receiver gap, patterned depositions of polyfluorene-based OLED pixels have been achieved. OLED pixel functionality has been demonstrated and compared with devices made using conventional deposition techniques. In addition, improved functionality has been obtained by coating the cathode with an electron-injecting layer, a process not possible using conventional OLED fabrication techniques. The OLED pixels fabricated by LIFT reach efficiencies on the range of conventionally fabricated devices and even surpass them in the case of blue pixels.

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confidence: 99%

Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer

Shaw-Stewart

Lippert

Nagel

et al. 2012

Applied Physics Letters

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“…The ability to transfer OLED materials to structured substrates largely depends on a number of parameters including donor film properties, a set of OLED materials, receptor topography, lamination process, laser scanning conditions, etc. When we applied conformal donor film with interlayer which allows for more expansion during laser irradiation, we could eliminate a typical defect called "edge crack", a fracturing of the OLED transfer material at the periphery of the pixel well due to the step height of pixel defining layer (PDL) [5,6]. Figure 2 For bilayer LITI transfer, transfer layers are comprised of the emissive layer and complete or partial hole transport layer successively deposited on donor film.…”

Section: Liti Oled Performancementioning

confidence: 99%

53.2: Invited Paper: Large‐Area Color‐Patterning Technology for AMOLED

Suh

Kang

Cho

et al. 2009

Symp Digest of Tech Papers

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In this paper, we describe a novel color patterning method for the fabrication of large area full‐color AMOLEDs. Laser Induced Thermal Imaging (LITI) is a laser addressed thermal patterning technology with unique advantages such as excellent uniformity of transfer film thickness, capability of multilayer stack transfer, high resolution and scalability to large‐Size mother glass. We developed and optimized transfer films, structure of OLED layers, and laser scanning conditions for the patterning of evaporated small molecules. As a result, we achieved excellent LITI device stability which yielded the device life time more than 25,000 hrs at 250 cd/m2 white brightness.

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“…For small size AMOLED display, the fine metal mask (FMM) technology is usually used to form EL layer on the TFT backplane with thermal deposition, but due to the alignment problem caused by mask sages downward when the mask size is become large. So, it becomes a challenge for large size AMOLED manufacture [3]. Instead of FMM technology, wet process, especially, ink jet printing technology attract much attention because it is well compatible for large size display using large TFT substrate without any alignment problem [4~5].…”

Section: Introductionmentioning

confidence: 99%