Sequential Printing by Laser-Induced Forward Transfer To Fabricate a Polymer Light-Emitting Diode Pixel
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- 作者：James R. H. Shaw-Stewart ; Thomas K. Lippert ; Matthias Nagel ; Frank A. N眉esch ; Alexander Wokaun
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：July 25, 2012
- 年：2012
- 卷：4
- 期：7
- 页码：3535-3541
- 全文大小：425K
- 年卷期：v.4,no.7(July 25, 2012)
- ISSN：1944-8252
文摘
Patterned deposition of polymer light-emitting diode (PLED) pixels is a challenge for electronic display applications. PLEDs have additional problems requiring solvent orthogonality of different materials in adjacent layers. We present the fabrication of a PLED pixel by the sequential deposition of two different layers with laser-induced forward transfer (LIFT), a 鈥渄ry鈥?deposition technique. This novel use of LIFT has been compared to 鈥渘ormal鈥?LIFT, where all the layers are transferred in a single step, and a conventional PLED fabrication process. For the sequential LIFT, a 50-nm film of an alcohol-soluble polyfluorene (PFN) is transferred onto a receiver with a transparent anode, before an aluminum cathode is transferred on top. Both steps use a triazene polymer dynamic release layer and are performed in a medium vacuum (1 mbar) across a 15 渭m gap. The rough morphologies of the single-layer PFN pixels and the PLED device characteristics have been investigated and compared to both bilayer Al/PFN pixels fabricated by normal LIFT and conventionally fabricated devices. The functionality of the sequential LIFT pixels (0.003 cd/A, up to 200 mA/cm2, at 30鈥?0 V) demonstrates the suitability of LIFT for sequential patterned printing of different thin-film layers.