Journal
OPTICAL MATERIALS EXPRESS
Volume 8, Issue 2, Pages 221-230Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.8.000221
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) [2017R1A2B3008628, 2015M3D1A1069755]
- NRF - Ministry of Education [2015R1A6A1A03031833]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry Energy (MOTIE) [20163030013980]
- Korea Institute for Advancement of Technology (KIAT) [N0001783]
- Korea Evaluation Institute of Industrial Technology (KEIT) [N0001783] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Photoluminescence (PL) of quantum dots (QDs) can be modulated by doping transition metal ions into them, yielding either only a dopant-related single PL band with an excitonic emission entirely quenched or multiple PL bands with a dopant-related PL superposed, depending on the host QD composition targeted. Herein, we attempt Mn doping into green-emitting CuGaS2 (CGS) QDs through surface adsorption and lattice diffusion strategy. The resulting Mn-doped, ZnS-shelled CGS or CGS: Mn/ZnS QDs exhibit two distinct PL bands associated with host QD defect and dopant emissions. The spectral ratio of such two PL components is facilely tunable by varying Mn concentration. A series of CGS: Mn/ZnS QDs possess high PL quantum yields in the range of 74-76% regardless of Mn concentration. Taking full advantage of the wide PL coverage of green-to-red and efficient absorption capability at the blue region of the present doped QDs, they are packaged as single downconverters with a blue light-emitting diode (LED) chip to fabricate a high-color rendering solid-state lighting device. Various electroluminescent characteristics of white QD-LED are evaluated as a function of QD doping concentration and input current and discussed in detail. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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