Screen and stencil printed graphene heat spreaders on printed circuit boards for lowering of light emitting diode temperatures
- Author(s)
- Reinhard Kaindl, David Dergez, Tushar Gupta, Songfeng Pei, Peng Xiang Hou, Jinhong Du, Chang Liu, Bernhard Fickl, Martin Nastran, Ya Liu, Alexander Blümel, Dominik Eder, Johan Liu, Wencai Ren, Paul Hartmann, Wolfgang Waldhauser, Dietmar Kieslinger, Bernhard C. Bayer
- Abstract
Continuously higher integration levels in (opto-)electronics require new solutions and materials for thermal management of excess heat. Here we investigate the integration of graphene-based heat spreader films with printed circuit board (PCB) assembled, high-power light emitting diodes (LEDs), as used in modern automotive lighting, using industrially highly scalable screen printing and stencil printing of the graphene-based films. We compare screen/stencil printing of graphene heat spreaders on the PCBs from archetypical water- and ester-based inks and characterize the resulting graphene heat spreaders with respect to printing fidelity and resolution, film microstructure, electrical and thermal properties and their performance in lowering LED temperatures during LED operation. Importantly, we use only comparatively low graphene film curing temperatures (150 °C) that are compatible with industrial PCB/surface-mounted-device (SMD) LED integration processes. We find that screen-printed, ester-based graphene heat spreaders result in a modest reduction of LED temperature during operation of on average − 2 K with a maximum reduction of −4 K. Generally, our work establishes the feasibility of scalable screen and stencil printing for integration of graphene films with state-of-the-art PCB/SMD assemblies.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Institute of Water Resource Management, ZKW Elektronik GmbH, Technische Universität Wien, Chinese Academy of Sciences (CAS), Chalmers University of Technology
- Journal
- Surface and Coatings Technology
- Volume
- 517
- No. of pages
- 8
- ISSN
- 0257-8972
- DOI
- https://doi.org/10.1016/j.surfcoat.2025.132821
- Publication date
- 12-2025
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104011 Materials chemistry, 103020 Surface physics
- Keywords
- ASJC Scopus subject areas
- General Chemistry, Condensed Matter Physics, Surfaces and Interfaces, Surfaces, Coatings and Films, Materials Chemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/32b83455-1106-4704-9089-790800840cfc