Tuning the spectrometric properties of white light by surface plasmon effect using Ag nanoparticles in a colour converting light-emitting diode |
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Authors: | S. ChandramohanBeo Deul Ryu P. UthirakumarJi Hye Kang Hyun Kyu KimHyung Gu Kim Chang-Hee Hong |
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Affiliation: | Semiconductor Physics Research Centre, School of Semiconductor and Chemical Engineering, Chonbuk National University, Chonju 561-756, South Korea |
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Abstract: | We report on the spectral tunability of white light by localized surface plasmon (LSP) effect in a colour converting hybrid device made of CdSe/ZnS quantum dots (QDs) integrated on InGaN/GaN blue light-emitting diodes (LEDs). Silver (Ag) nanoparticles (NPs) are mixed with QDs for generating LSP effect. When the plasmon absorption of Ag NPs is synchronized to the QW emission at 448 nm, the NPs selectively absorb the blue light and subsequently enhance the QD emission. Using this energy transfer scheme, the (x, y) chromaticity coordinates of the hybrid white LED was tuned from (0.32, 0.17) to (0.43, 0.26), and thereby generated warm white light emission with correlated colour temperature (CCT) around 1800 K. Moreover, a 47% enhancement in the external quantum efficiency (EQE) was realized. |
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Keywords: | InGaN/GaN light-emitting diode Quantum dots White light emission Surface plasmon effect |
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