期刊
ENERGY MATERIAL ADVANCES
卷 2021, 期 -, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.34133/2021/3245731
关键词
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资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2020M3H4A1A01086888, 2020M3D1A2101319, 2020R1A2C2011478, 2019M3D1A1078299]
- Ministry of Trade, Industry & Energy (MOTIE, Korea) [20010737]
- Electronics and Telecommunications Research Institute (ETRI) - Korean Government [20ZB1200]
- Sao Paulo Research Foundation (FAPESP) [2018/15574-6]
- Samsung Display
- Korea Evaluation Institute of Industrial Technology (KEIT) [20010737] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020M3D1A2101319] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Quasi-type II heterostructured nanocrystals have shown great potential for controlling charge carriers, but material choices have limited their emission wavelength range. By engineering the layers and wave functions, ZnSe/ZnSe1-XTeX/ZnSe/ZnS NCs exhibit near-unity photoluminescence quantum yield across a broad range of emission wavelengths (450nm to 600nm). Dichromatic white NC-based light-emitting diodes using a mixed layer of blue- and yellow-emitting ZnSe/ZnSe1-XTeX/ZnSe/ZnS SQW NCs have been successfully demonstrated.
Quasi-type II heterostructured nanocrystals (NCs) have been of particular interest due to their great potential for controlling the interplay of charge carriers. However, the lack of material choices for quasi-type II NCs restricts the accessible emission wavelength from red to near-infrared (NIR), which hinders their use in light-emitting applications that demand a wide range of visible colors. Herein, we demonstrate a new class of quasi-type II nanoemitters formulated in ZnSe/ZnSe1-XTeX/ZnSe seed/spherical quantum well/shell heterostructures (SQWs) whose emission wavelength ranges from blue to orange. In a given geometry, ZnSe1-XTeX emissive layers grown between the ZnSe seed and the shell layer are strained to fit into the surrounding media, and thus, the lattice mismatch between ZnSe1-XTeX and ZnSe is effectively alleviated. In addition, composition of the ZnSe1-XTeX emissive layer and the dimension of the ZnSe shell layer are engineered to tailor the distribution and energy of electron and hole wave functions. Benefitting from the capabilities to tune the charge carriers on demand and to form defectfree heterojunctions, ZnSe/ZnSe1-XTeX/ZnSe/ZnS NCs show near-unity photoluminescence quantum yield (PLQY > 90%) in a broad range of emission wavelengths (peak PL from 450nm to 600 nm). Finally, we exemplify dichromatic white NC-based light-emitting diodes (NC-LEDs) employing the mixed layer of blue- and yellow-emitting ZnSe/ZnSe1-XTeX/ZnSe/ZnS SQW NCs.
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