Tunable Dual Emission in Doped Semiconductor Nanocrystals

Vlaskin, Vladimir A.; Janssen, Nils; Rijssel, Jos van; Beaulac, Rémi; Gamelin, Daniel R.

doi:10.1021/nl102135k

Cited by 297 publications

(332 citation statements)

References 30 publications

Supporting

Mentioning

315

Contrasting

Unclassified

Order By: Relevance

“…This doping strategy was similar to dual-emissive CdS/Mn:ZnS core/shell NCs reported by Cao's group [87]. This result was consistent with those observed in typical dual-emissive Mn-doped ZnCdSe NCs [90]. Therefore, The PL spectrum showed two distinguished peaks, one of which was attributed to Mn-related emissions and the other resulted from gradient Zn-Cu-In-S NCs.…”

Section: Resultssupporting

confidence: 90%

“…For example, dual emissive CdSe/ ZnS/CdSe NCs have been used to produce white light by combination with blue and ultraviolet LEDs [52]. However, the emission wavelength of these dual emissive NCs can only be tuned in a limited spectral range [51][52][53][54][55][56][57][58][59][60], which also limits the tunability of color temperature for the NCs-based WLEDs. Generally, these most widely used color converters are not only highly sensitive to the temperature, but are also restricted, especially the cadmium/lead-based, particularly in view of recent environmental regulations and potential application in the fabrication of WLEDs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Peng

Zhang

et al. 2015

Nano Res.

View full text Add to dashboard Cite

Non-cadmium" dual emissive QDs have been directly synthesized using a one-pot hot-injection technique. A white LED was successfully fabricated using a commercial blue-LED chip combined with the optimal QDs. ABSTRACTThe global demand for resource sustainability is growing. Thus, the development of single-source environment-friendly colloidal semiconductor nanocrystal (NC) phosphors with broadband emission is highly desirable for use as color converters in white light-emitting diodes (WLEDs). We report herein the gram-scale synthesis of single-source, cadmium-free, dual-emissive Mn-doped Zn-Cu-In-S NCs (d-dots) by a simple, non-injection, and low-cost approach in one-pot fashion. This synthesis approach led to the formation of NCs with continuously varying compositions in a radial direction because the reactivity of precursors totally differed among these precursors. Consequently, d-dots exhibited two emission bands, one of which was due to Mn-related emissions and the other was due to the band edge of Zn-Cu-In-S NCs. Emission peaks assigned to band edge were tunable by simple control of particle size and composition. The prepared d-dots also exhibited the characteristic zero self-absorption, a quantum yield of 46%, and good thermal stability. A combination of a commercial blue LED chip with optimal d-dots as color converters gave a high color rending index of up to 90, Commission International de l'Eclairage color coordinates of (0.332, 0.321), and correlated color temperature of 5680 K. These results suggested that this cadmium-free, excellent thermally stable single-phase d-dot phosphor had potential applications in WLEDs. Nano Research DOI () Research Article| www.editorialmanager.com/nare/default.asp 2 Nano Res.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Peng

Zhang

et al. 2015

Nano Res.

View full text Add to dashboard Cite

show abstract

“…It has been found that the relative intensity of excitonic emission increases with temperature. A discussion of the thermal population mechanisms and its effect on photoluminescence was presented by Beaulac et al 104 and Vlaskin et al 80 The maximum relative sensitivity values reported near room temperature for these QDs are 1.3% K À1 at 318 K (ref. 80) ( Table 2 and Fig.…”

mentioning

confidence: 98%

“…This was first reported by Vlaskin et al in Zn 1Àx Mn x Se-ZnCdSe core-shell QD structures. 80 The solubility of such Mn-doped colloidal semiconductor QDs in water was recently achieved, enabling their use in biophysical applications.…”

mentioning

confidence: 99%

Thermometry at the nanoscale

et al. 2012

View full text Add to dashboard Cite

Non-invasive precise thermometers working at the nanoscale with high spatial resolution, where the conventional methods are ineffective, have emerged over the last couple of years as a very active field of research. This has been strongly stimulated by the numerous challenging requests arising from nanotechnology and biomedicine. This critical review offers a general overview of recent examples of luminescent and non-luminescent thermometers working at nanometric scale. Luminescent thermometers encompass organic dyes, QDs and Ln 3+ ions as thermal probes, as well as more complex thermometric systems formed by polymer and organic-inorganic hybrid matrices encapsulating these emitting centres. Non-luminescent thermometers comprise of scanning thermal microscopy, nanolithography thermometry, carbon nanotube thermometry and biomaterials thermometry. Emphasis has been put on ratiometric examples reporting spatial resolution lower than 1 micron, as, for instance, intracellular thermometers based on organic dyes, thermoresponsive polymers, mesoporous silica NPs, QDs, and Ln 3+ -based up-converting NPs and b-diketonate complexes. Finally, we discuss the challenges and opportunities in the development for highly sensitive ratiometric thermometers operating at the physiological temperature range with submicron spatial resolution.

show abstract

“…Nanocrystalline materials can exhibit interesting optical properties that may vary significantly in comparison with bulk crystals of the same chemical composition and this has attracted a great deal of interest in recent years [1][2][3][4][5]. For example, optical properties of transition metal and rare earth doped wide bandgap nanoparticles have been investigated.…”

Section: Introductionmentioning

confidence: 99%