Visible Flip-Chip Light-Emitting Diodes on Flexible Ceramic Substrate With Improved Thermal Management

We demonstrate flip-chip light-emitting diodes (FC-LEDs) on a flexible yttria-stabilized zirconia (YSZ) substrate and compare them with FC-LEDs on a polymeric substrate. Degradation of luminescence intensity and red-shift of peak wavelength are not observed for the LED on the flexible YSZ, unlike on...

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Bibliographic Details
Published in:IEEE electron device letters 2016-05, Vol.37 (5), p.615-617
Main Authors: Seung Hwan Kim, Singh, Shivkant, Seung Kyu Oh, Dong Kyu Lee, Keon Hwa Lee, Shervin, Shahab, Asadirad, Mojtaba, Venkateswaran, Venkat, Olenick, Kathy, Olenick, John A., Sung-Nam Lee, Joon Seop Kwak, Mavrokefalos, Anastassios, Jae-Hyun Ryou
Format: Article
Language:English
Subjects:
Ceramics
flexible display
Heating
Light emitting diodes
light-emitting diodes (LEDs)
polyimide
Polyimides
Substrates
Temperature measurement
Thermal conductivity
yttria-stabilized zirconia
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Summary:We demonstrate flip-chip light-emitting diodes (FC-LEDs) on a flexible yttria-stabilized zirconia (YSZ) substrate and compare them with FC-LEDs on a polymeric substrate. Degradation of luminescence intensity and red-shift of peak wavelength are not observed for the LED on the flexible YSZ, unlike one on the polyimide substrate, due to improved capability to remove the generated heat from the chip to the substrate. Thermal distribution measurements and finite-element simulations show improved thermal management by the flexible ceramic as compared with previously developed flexible LEDs on polymeric substrates. The results present an improved solution to high power operation of flexible LEDs.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2016.2547877