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Cited 1 time in webofscience Cited 4 time in scopus
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Large Wavelength Response to Pressure Enabled in InGaN/GaN Microcrystal LEDs with 3D Architectures

Authors
Yang, Dong WonLee, KeundongJang, SuheeChang, Won JunKim, Su HanLee, Jae HyungYi, Gyu-ChulIl Park, Won
Issue Date
May-2020
Publisher
AMER CHEMICAL SOC
Keywords
micro-LED; InGaN/GaN microcrystal; pressure sensor; optical sensor; wavelength change
Citation
ACS PHOTONICS, v.7, no.5, pp.1122 - 1128
Indexed
SCIE
SCOPUS
Journal Title
ACS PHOTONICS
Volume
7
Number
5
Start Page
1122
End Page
1128
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1947
DOI
10.1021/acsphotonics.0c00251
Abstract
Optical detection of pressure has the advantage of direct and dynamic indication of the pressure distribution with a high spatial resolution. In this study, microcrystal (mu-crystal) light-emitting diodes (LEDs) that can exhibit an unprecedented large wavelength response to pressure are demonstrated. As a key strategy, three-dimensional InGaN/GaN mu-crystals are engineered to have a hollow core and multiple facets with different multiple quantum well (MQW) structures. The unique structure allows pressure-sensitive modulation of the dominantly emitting MQWs, resulting in an anomalously large change of similar to 50 nm in the ultimate emission wavelength under an external stress of 8 MPa. The underlying mechanism is elucidated via finite-element analysis of the strain development in the mu-crystals and the corresponding piezo-potentials. The results of the study suggest a new capability for dynamic color mapping of the pressure distribution with a high spatial resolution.
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