Open AccessEfficiency enhancement of light color conversion through surface plasmon coupling
Author(s) -
Chun-Han Lin,
Hsin-Chun Chiang,
Yao-Tseng Wang,
Yufeng Yao,
ChiChung Chen,
Wai Fong Tse,
Ruei-Nan Wu,
WenChun Chang,
YaoHaur Kuo,
YeanWoei Kiang,
Chengxu Yang
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.023629
Subject(s) - materials science , photoluminescence , optoelectronics , surface plasmon resonance , quantum dot , surface plasmon , absorption (acoustics) , light emitting diode , localized surface plasmon , purcell effect , optics , wavelength , quantum efficiency , laser , emission intensity , plasmon , spontaneous emission , nanoparticle , nanotechnology , physics , composite material
The efficiency enhancement of light color conversion from blue quantum well (QW) emission into red quantum dot (QD) emission through surface plasmon (SP) coupling by coating CdSe/ZnS QDs on the top of an InGaN/GaN QW light-emitting diode (LED) is demonstrated. Ag nanoparticles (NPs) are fabricated within a transparent conductive Ga-doped ZnO interlayer to induce localized surface plasmon (LSP) resonance for simultaneously coupling with the QWs and QDs. Such a coupling process generates three enhancement effects, including QW emission, QD absorption at the QW emission wavelength, and QD emission, leading to an overall enhancement effect of QD emission intensity. An Ag NP geometry for inducing an LSP resonance peak around the middle between the QW and QD emission wavelengths results in the optimized condition for maximizing QD emission enhancement. Internal quantum efficiency and photoluminescence (PL) decay time measurements are performed to show consistent results with LED performance characterizations, even though the QD absorption of PL excitation laser may mix with the SP-induced QD absorption enhancement effect in PL measurement.