White Light Emission Characteristics of Polymer-Encapsulated CdSe Nanocrystal Films

Gosnell, Jonathan D.; Rosenthal, Sandra J.; Weiss, Sharon M.

doi:10.1109/lpt.2010.2041549

Cited by 27 publications

(21 citation statements)

References 14 publications

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“…Chromaticity coordinates of the LED were calculated between (0.37, 0.54) and (0.35, 0.49) with increasing current from 50 to 350 mA (Figure 6c). The luminous efficacy of optical radiation (LER) of this LED reaches 300 lm W opt −1 as presented in Figure b, greatly surpassing the previous results from the LEDs utilizing NPLs and small QDs (2 nm < diameter) because of the strong overlap of the NPL emission with the human eye sensitivity function and the high QY of solid films of our NPLs. However, as can be seen in Figure b, the emission from the exciting LED at 380 nm leads to a reduction at high currents in the LER performance since it can be only weakly sensed by the human eye.…”

Section: Resultscontrasting

confidence: 51%

Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets

Delikanlı

Yeltik

et al. 2019

Adv Funct Materials

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Surface effects in atomically flat colloidal CdSe nanoplatelets (NLPs) are significantly and increasingly important with their thickness being reduced to subnanometer level, generating strong surface related deep trap photoluminescence emission alongside the bandedge emission. Herein, colloidal synthesis of highly luminescent two-monolayer (2ML) CdSe NPLs and a systematic investigation of carrier dynamics in these NPLs exhibiting broad photoluminescence emission covering the visible region with quantum yields reaching 90% in solution and 85% in a polymer matrix is shown. The astonishingly efficient Stokes-shifted broadband photoluminescence (PL) emission with a lifetime of ≈100 ns and the extremely short PL lifetime of around 0.16 ns at the bandedge signify the participation of radiative midgap surface centers in the recombination process associated with the underpassivated Se sites. Also, a proof-of-concept hybrid LED employing 2ML CdSe NPLs is developed as color converters, which exhibits luminous efficacy reaching 300 lm W opt −1 . The intrinsic absorption of the 2ML CdSe NPLs (≈2.15 × 10 6 cm −1 ) reported in this study is significantly larger than that of CdSe quantum dots (≈2.8 × 10 5 cm −1 ) at their first exciton signifying the presence of giant oscillator strength and hence making them favorable candidates for next-generation light-emitting and light-harvesting applications.

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Section: Resultscontrasting

confidence: 51%

Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets

Delikanlı

Yeltik

et al. 2019

Adv Funct Materials

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“…Also, utilizing the modulation of the phosphonic acid ligand could control the nanocrystal surface‐state emission, indicating that the surface ligand played the dominant role in tuning the emission properties of these nanocrystals. Another improvement by Rosenthal's group was to increase the loading level of these white‐light nanocrystals into the encapsulating polymer,76–78 such as biphenylperfluorocyclobutyl polymer. In this polymer, the nanocrystal loading level could reach up to 18%, where the encapsulated ultrasmall CdSe nanocrystals created white light with CIE coordinates of (0.324, 0.322) and a high CRI of 93.…”

Section: Semiconductor‐nanocrystals‐based Wledsmentioning

confidence: 99%

Semiconductor‐Nanocrystals‐Based White Light‐Emitting Diodes

Dai

Duty

2010

Small

237

169

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In response to the demands for energy and the concerns of global warming and climate change, energy efficient and environmentally friendly solid-state lighting, such as white light-emitting diodes (WLEDs), is considered to be the most promising and suitable light source. Because of their small size, high efficiency, and long lifetime, WLEDs based on colloidal semiconductor nanocrystals (or quantum dots) are emerging as a completely new technology platform for the development of flat-panel displays and solid-state lighting, exhibiting the potential to replace the conventionally used incandescent and fluorescent lamps. This replacement can cut the ever-increasing level of energy consumption, solve the problem of rapidly depleting fossil fuel reserves, and improve the quality of the global environment. In this review, the recent progress in semiconductor-nanocrystals-based WLEDs is highlighted, the different approaches for generating white light are compared, and the benefits and challenges of the solid-state lighting technology are discussed.

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“…3,4 For example, a WLED, with a color rendering index (CRI) of 91, was reported to be fabricated by using a ultraviolet light-emitting diode (LED) topped with a thin film of CdSe NCs encapsulated in a polymer. 5 Mn-doped II-VI group semiconductor nanocrystals, which exhibit a large Stokes shift and thus optical self-absorption can be avoided, have been utilized to get WLEDs by integrating them with ultraviolet LED chips. 6 CuInS 2 (CIS) semiconductor NCs have been considered as low toxic alternatives to be used in NC-based WLEDs.…”

mentioning

confidence: 99%

Bicolor Mn-doped CuInS2/ZnS core/shell nanocrystals for white light-emitting diode with high color rendering index

Huang

Dai

Zhuo

et al. 2014

Journal of Applied Physics

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We synthesized bicolor Mn-doped CuInS2 (CIS)/ZnS core/shell nanocrystals (NCs), in which Mn2+ ions and the CIS core were separated with a ZnS layer, and both Mn2+ ions and CIS cores could emit simultaneously. Transmission electron microscopy and powder X-ray diffraction measurements indicated the epitaxial growth of ZnS shell on the CuInS2 core, and electron paramagnetic resonance spectrum indicated that Mn2+ ions were on the lattice points of ZnS shell. By integrating these bicolor NCs with commercial InGaN-based blue-emitting diodes, tricolor white light-emitting diodes with color rendering index of 83 were obtained.

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White Light Emission Characteristics of Polymer-Encapsulated CdSe Nanocrystal Films

Cited by 27 publications

References 14 publications

Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets

Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets

Semiconductor‐Nanocrystals‐Based White Light‐Emitting Diodes

Bicolor Mn-doped CuInS2/ZnS core/shell nanocrystals for white light-emitting diode with high color rendering index

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