Kim, Misung
(Electronic Conversion Materials Division, Korea Institute of Ceramic Engineering and Technology)
,
Bang, Jiwon
(Electronic Conversion Materials Division, Korea Institute of Ceramic Engineering and Technology)
Colloidal semiconductor quantum dots (QDs), because of the novel optical and electrical properties that stem from their three-dimensional confinement, have attracted great interest for their potential applications in such fields as bio-imaging, display, and opto-electronics. However, many semiconduc...
Colloidal semiconductor quantum dots (QDs), because of the novel optical and electrical properties that stem from their three-dimensional confinement, have attracted great interest for their potential applications in such fields as bio-imaging, display, and opto-electronics. However, many semiconductors that can be exploited for QD applications contain toxic elements. Herein, we synthesized non-toxic ZnTe/ZnSe (core/shell) type-II QDs by pyrolysis method. Because of the unique type-II character of these QDs, their emission can range over an extended wavelength regime, showing photoluminescence (PL) from 450 nm to 580 nm. By optimizing the ZnSe shell growth condition, resulting ZnTe/ZnSe type-II QDs shows PL quantum yield up to ~ 25% with 35 nm PL bandwidth. Using a simple two step cation exchange reaction, we also fabricated ZnTe/ZnSe type-II QDs with absorption extended over the whole visible region. The visible-light sensitized heavy metal free ZnTe/ZnSe type-II QDs can be relevant for opto-electronic applications such as displays, light emitting diodes, and bio-imaging probes.
Colloidal semiconductor quantum dots (QDs), because of the novel optical and electrical properties that stem from their three-dimensional confinement, have attracted great interest for their potential applications in such fields as bio-imaging, display, and opto-electronics. However, many semiconductors that can be exploited for QD applications contain toxic elements. Herein, we synthesized non-toxic ZnTe/ZnSe (core/shell) type-II QDs by pyrolysis method. Because of the unique type-II character of these QDs, their emission can range over an extended wavelength regime, showing photoluminescence (PL) from 450 nm to 580 nm. By optimizing the ZnSe shell growth condition, resulting ZnTe/ZnSe type-II QDs shows PL quantum yield up to ~ 25% with 35 nm PL bandwidth. Using a simple two step cation exchange reaction, we also fabricated ZnTe/ZnSe type-II QDs with absorption extended over the whole visible region. The visible-light sensitized heavy metal free ZnTe/ZnSe type-II QDs can be relevant for opto-electronic applications such as displays, light emitting diodes, and bio-imaging probes.
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제안 방법
In this work, we synthesized a composite of ZnTe/ZnSe (core/shell) type-II QDs that absorbs and emits visible light. ZnTe core QDs were synthesized via high-temperature thermal decomposition to maximize the ZnSe shell layer and create visible light-emitting ZnTe/ZnSe (core/shell) type-II quantum dots that have a maximum 25% PL efficiency with half-width of 35 nm.
ZnTe core QDs were synthesized via high-temperature thermal decomposition to maximize the ZnSe shell layer and create visible light-emitting ZnTe/ZnSe (core/shell) type-II quantum dots that have a maximum 25% PL efficiency with half-width of 35 nm. Through further study, ZnTe/ZnSe (core/shell) type-II QDs that can absorb the entire visible light spectrum, using large CdTe/CdSe (core/shell) type-II QDs with two-step cation exchange reaction, were obtained. These environmentally friendly quantum dots that absorb and emit visible light are expected to be utilized in the field of highly efficient photovoltaic and in high definition display materials.
대상 데이터
The following reagents are used in the experiment: diethylzinc solution (1.0 M in hexanes, Aldrich), hexadecylamine (HDA, 98%, Aldrich), 1-octadecene (ODE, 90%, Aldrich), tellurium powder (Te, 99.997%, Aldrich), selenium powder (Se, 99.99%, Aldrich), zinc acetate (Zn(Ac)2, 99.99%, Aldrich), zinc chloride (ZnCl2, 99.999%, Aldrich), oleic acid (OA, 90%, Sigma-Aldrich), oleylamine (70%, Aldrich), trioctylphosphine (TOP, 97%, Strem), cadmium acetate dihydrate (98%, Sigma-Aldrich), tetradecyl phosphonic acid (TDPA, 97%, Aldrich), and tetrakis (acetonitrile) copper (I) hexafluoro phosphate ([Cu(CH3CN)4]PF6, 97%, Aldrich).
이론/모형
The work used the SILAR14) coating approach method as the basis of ZnTe/ZnSe core/shell QDs. First, for the preparation of TOP-Se precursor, Se was melted to 0.
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