Ternary ZnSeTe Quantum Dots as efficient visible emitters
Heesun Yang a, Sun-Hyoung Lee a, Dae-Yeon Jo a, Suk-Young Yoon a, Hyun-Min Kim a, Jee-Na Han a, Young-Ju Lee a
a Hongik University, Korea, Republic of
Proceedings of International Online Conference on Hybrid Materials and Optoelectronic Devices (HYBRIDOE21)
Online, Spain, 2021 December 15th - 17th
Organizers: Jinwei Gao, Hua Yu, Dewei Zhao, Haizheng Zhong, Hairen Tan and Xueqing Xu
Keynote, Heesun Yang, presentation 008
DOI: https://doi.org/10.29363/nanoge.hybridoe.2021.008
Publication date: 3rd December 2021

III−V type indium phosphide (InP) quantum dots (QDs) are now firmly positioned as heavy metal-free, environment-benign visible emitters of particularly green and red colors in next-generation display devices. On the basis of synthetic and core/shell heterostructural advances of InP QDs toward bright and sharp emissivity, they have been successfully exploited in the platform of light-emitting diode (LED) based on color conversion or self-emissive electroluminescence (EL). In contrast to substantial progress of green and red InP QDs, synthesis of blue InP ones with a bright, deep-blue emissivity is not likely viable, which is primarily associated with their intrinsic size limitation Meanwhile, although green InP QDs can exhibit comparable photoluminescence (PL) features in quantum yield (QY) and full-width-at-half-maximum (fwhm) to red InP ones, performances of green QD-based devices are inferior in both color conversion and EL to those of red QD-based ones. This is again likely correlated to the size issue, that is, smaller size of green InP core relative to red one, thus necessitating the development of alternative non-InP green emitters. In this talk, we introduce II−VI type ternary ZnSeTe QDs as blue-to-red emitters, which may be potential alternatives to InP counterparts. Taking full advantage of state-of-the-art multiple shelling scheme, high PL and EL performances of ZnSeTe QDs are demonstrated.

This work was financially supported by the National Research Foundation of Korea (NRF) grant funded by Ministry of Science, ICT & Future Planning (MSIP) (2017R1A2B3008628), Basic Science Research Program through the NRF funded by Ministry of Education (2015R1A6A1A03031833), and the Technology Innovation Program (20010737, 20016332) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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