Efficiency enhancement of light color conversion through surface plasmon coupling

• DOI: 10.1364/oe.26.023629
• Publication Date: 2018-08-28T22:30:48Z
• Authors: Chun-Han Lin; Hsin-Chun Chiang; Yao-Tseng Wang; Yu-Feng Yao; Chi-Chung Chen; Wai Fong Tse; Ruei-Nan Wu; Wen-Yen Chang; Yang Kuo; Yean-Woei Kiang; C. C. Yang
• Keywords: Localized surface plasmon; Purcell effect; Quantum Efficiency; Emission intensity

The efficiency enhancement of light color conversion from blue quantum well (QW) emission into red dot (QD) through surface plasmon (SP) coupling by coating CdSe/ZnS QDs on the top 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 (LSP) resonance for simultaneously with QWs and QDs. Such process generates three effects, including emission, QD absorption at wavelength, leading overall effect intensity. An NP geometry inducing LSP peak around middle between wavelengths results in optimized condition maximizing enhancement. Internal photoluminescence (PL) decay time measurements performed show consistent LED performance characterizations, even though PL excitation laser may mix SP-induced measurement.