Enhanced light emission from AlGaN/GaN multiple quantum wells using localized surface plasmon by aluminum anoring patterns

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We investigate the localized surface plasmon (LSP) effect by Al nanorings on the AlGaN/GaN multiple quantum well (MQW) structure emitting at 365 nm. For this experiment, first, the size of Al nanorings is optimized to maximize the energy transfer (or coupling) between the LSP and MQW using the silica nanospheres. Then, the Al nanorings with an outer diameter of 385 nm, which exhibit a strong absorption peak in the near-ultraviolet region, are applied to the top surface of the AlGaN/GaN MQW. The photoluminescence (PL) intensity of the MQW structure with Al nanorings increased by 227% at 365 nm compared to that without Al nanorings. This improvement is mainly attributed to an enhanced radiative recombination rate in the MQWs through the energy-matched LSPs by the temperature-dependent PL and time-resolved PL analyses. The radiative lifetime was about two times shorter than that of the structure without Al nanorings at room temperature. In addition, the measured PL efficiency at room temperature of the structure with Al nanorings was 33%, while that of the structure without Al nanorings was 19%, implying that LSP-QW coupling together with the nanoring array pattern itself played important roles in the enhancement.
Publisher
OSA Publishing
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

EMITTING-DIODES; DYNAMICS; LEDS

Citation

Photonics Research, v.6, no.1, pp.30 - 36

ISSN
2327-9125
DOI
10.1364/PRJ.6.000030
URI
http://hdl.handle.net/10203/238753
Appears in Collection
PH-Journal Papers(저널논문)
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