Chemically Tunable, All-Inorganic-Based White-Light Emitting 0D-1D Heterostructures

Yue, Shiyu; Zhou, Yuchen; Zou, Shihui; Wang, Lei; Liu, Haiqing; Wong, Stanislaus S.

doi:10.1002/adom.201700089

Title: Chemically Tunable, All-Inorganic-Based White-Light Emitting 0D-1D Heterostructures

Journal Article · Mon Aug 21 00:00:00 EDT 2017 · Advanced Optical Materials

DOI:https://doi.org/10.1002/adom.201700089· OSTI ID:1389215

Yue, Shiyu ^[1]; Zhou, Yuchen ^[1]; Zou, Shihui ^[1]; Wang, Lei ^[1]; Liu, Haiqing ^[1]; Wong, Stanislaus S. ^[2]

State Univ. of New York (SUNY), Stony Brook, NY (United States)
State Univ. of New York (SUNY), Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

In this study, we initially created one-dimensional (1D) Mn2+-doped ZnS (ZnS: Mn) nanowires (NWs) with a unique optical signature. Specifically, these nanostructures coupled (i) ZnS defect-related self-activated emission spanning from wavelengths of 400 nm to 500 nm with (ii) Mn2+ dopant-induced emission centered at ~580 nm. These doped ZnS nanostructures were initially fabricated for the first time via a template-based co-precipitation approach followed by a post-synthesis annealing process. We subsequently formed novel 1D - zero-dimensional (0D) heterostructures incorporating ZnS: Mn NWs and AET (2-amino-ethanethiol) - CdSe quantum dots (QDs) by assembling annealed ZnS: Mn NWs with AET- capped CdSe QDs as building blocks via a simple technique, involving physical sonication and stirring. Optical analyses of our heterostructures were consistent with charge (hole) and energy transfer-induced quenching of ZnS self-activated emission coupled with hole transfer-related quenching of Mn2+ emission by the QDs. The CdSe QD emission itself was impacted by competing charge (electron) and energy transfer processes occurring between the underlying ZnS host and the immobilized CdSe QDs. Chromaticity analysis revealed the significance of controlling both QD coverage density and Mn2+ dopant ratios in predictably influencing the observed color of our all-inorganic heterostructures. For example, white-light emitting behavior was especially prominent in composites, simultaneously characterized by (i) a 2.22% Mn2+ doping level and (ii) a molar compositional ratio of [ZnS: Mn2+]: [AET-capped CdSe QDs]) of 1: 1.5. Moreover, using these independent chemical ‘knobs’, we have been able to reliably tune for a significant shift within our composites from ‘cold-white’ (9604 K) to ‘warm-white’ (4383 K) light emission.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1389215

Alternate ID(s):: OSTI ID: 1375652

Report Number(s):: BNL-114071-2017-JA; R&D Project: PM037; KC0201030

Journal Information:: Advanced Optical Materials, Vol. 5, Issue 20; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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