Doped Semiconductor-Nanocrystal Emitters with Optimal Photoluminescence Decay Dynamics in Microsecond to Millisecond Range: Synthesis and Applications.
ACS Cent Sci
; 2(1): 32-9, 2016 Jan 27.
Article
en En
| MEDLINE
| ID: mdl-27163024
ABSTRACT
Transition metal doped semiconductor nanocrystals (d-dots) possess fundamentally different emission properties upon photo- or electroexcitation, which render them as unique emitters for special applications. However, in comparison with intrinsic semiconductor nanocrystals, the potential of d-dots has been barely realized, because many of their unique emission properties mostly rely on precise control of their photoluminescence (PL) decay dynamics. Results in this work revealed that it would be possible to obtain bright d-dots with nearly single-exponential PL decay dynamics. By tuning the number of Mn(2+) ions per dot from â¼500 to 20 in Mn(2+) doped ZnSe nanocrystals (MnZnSe d-dots), the single-exponential PL decay lifetime was continuously tuned from â¼50 to 1000 µs. A synthetic scheme was further developed for uniform and epitaxial growth of thick ZnS shell, â¼7 monolayers. The resulting MnZnSe/ZnS core/shell d-dots were found to be essential for necessary environmental durability of the PL properties, both steady-state and transient ones, for the d-dot emitters. These characteristics combined with intense absorption and high PL quantum yields (70 ± 5%) enabled greatly simplified schemes for various applications of PL lifetime multiplexing using MnZnSe/ZnS core/shell d-dots.
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01-internacional
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MEDLINE
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En
Revista:
ACS Cent Sci
Año:
2016
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Article