Single and Dual Doping of Blue-Emissive ZnSeTe Quantum Dots with Transition Metal Ions
- Authors
- Song, Seung-Won; Lee, Sun-Hyoung; Jo, Dae-Yeon; Yoon, Suk-Young; Kim, Hyun-Min; Kim, Yuri; Han, Jee-Na; Lee, Young-Ju; Do, Young Rag; Yang, Heesun
- Issue Date
- 18-Jan-2022
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- doping; electroluminescence; transition metal ions; white emission; ZnSeTe quantum dots
- Citation
- ADVANCED OPTICAL MATERIALS, v.10, no.2
- Journal Title
- ADVANCED OPTICAL MATERIALS
- Volume
- 10
- Number
- 2
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/18186
- DOI
- 10.1002/adom.202101767
- ISSN
- 2195-1071
- Abstract
- Doping particularly with transition metal ions is an effectual means to modulate photoluminescence (PL) of quantum dots (QDs). The precedent doped QDs rely primarily on single doping with either Cu+ or Mn2+ into the most common host compositions of (Zn)CdS, ZnSe, and InP, with little success on co-doping with both impurities enabling their simultaneous emissions. Herein, single and dual doping are explored with Cu+ and/or Mn2+ into blue-emissive ZnSeTe QDs. PL of the singly doped ZnSeTe QDs synthesized via a co-nucleation process, comprising host and dopant emissions, is spectrally tuned by varying the concentration of each dopant. For the effective dual doping toward co-emergence of both dopant-related emissions, a two-step doping strategy, where co-nucleation doping of Mn2+ is temporally decoupled from diffusion doping of Cu+, is devised. In the resulting co-doped ZnSeTe QDs, successfully showing three distinct emission components, the relative spectral distribution of triple emissions is readily modulated by individually adjusting Cu and Mn concentrations, producing color-quality tunable white emissions. Upon elaborate multishelling, the co-doped QDs display outstanding PL quantum yields of 72-75%. Singly and dually doped QDs are further applied for the fabrication of QD light-emitting diodes, and their electroluminescence is examined compared to PL.
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