Unconventional formation of dual-colored InP quantum dot-embedded silica composites for an operation-stable white light-emitting diode

Jang, Eun-Pyo; Jo, Jaemin; Lim, Seung-Won; Lim, Han-Byule; Kim, Hwi-Jae; Han, Chang-Yeol; Yang, Heesun

doi:10.1039/c8tc04095h

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…Since then, InP NCs with aminophosphine precursors have been further investigated: utilizing the precursors, the resulting green NCs achieved comparable PL performance to previous work with P(SiMe 3 ) 3 (PLQY: 82 vs. 85%) (Jang et al, 2018). Tetrahedrally shaped InP NCs with improved stability ascribed to oleylamine and chloride ligands (Kim et al, 2016).…”

Section: Phosphorus Precursors In Colloidal Synthesis Of Inp Nanocrysmentioning

confidence: 96%

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Jia

Meng

et al. 2019

Front. Chem.

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Colloidal nanocrystals (NCs) have emerged as promising materials in optoelectronic devices and biological imaging application due to their tailorable properties through size, shape, and composition. Among these NCs, metal phosphide is an important class, in parallel with metal chalcogenide. In this review, we summarize the recent progress regarding the chemical synthesis and applications of colloidal metal phosphide NCs. As the most important metal phosphide NCs, indium phosphide (InP) NCs have been intensively investigated because of their low toxicity, wide and tunable emission range from visible to the near-infrared region. Firstly, we give a brief overview of synthetic strategies to InP NCs, highlighting the benefit of employing zinc precursors as reaction additive and the importance of different phosphorus precursors to improve the quality of the InP NCs, in terms of size distribution, quantum yield, colloidal stability, and non-blinking behavior. Next, we discuss additional synthetic techniques to overcome the issues of lattice mismatch in the synthesis of core/shell metal phosphide NCs, by constructing an intermediate layer between core/shell or designing a shell with gradient composition in a radial direction. We also envision future research directions of InP NCs. The chemical synthesis of other metal phosphide NCs, such as II–V metal phosphide NCs (Cd3P2, Zn3P2) and transition metal phosphides NCs (Cu3P, FeP) is subsequently introduced. We finally discuss the potential applications of colloidal metal phosphide NCs in photovoltaics, light-emitting diodes, and lithium ion battery. An overview of several key applications based on colloidal metal phosphide NCs is provided at the end.

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Section: Phosphorus Precursors In Colloidal Synthesis Of Inp Nanocrysmentioning

confidence: 96%

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Jia

Meng

et al. 2019

Front. Chem.

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“…Magnetic iron oxide particles coated in silica show increased resistance against oxidation . Even with the insulating properties of silica, monoliths of SiO 2 -coated NCs have found applications in electronic devices such as light-emitting diodes , and photodetectors …”

Section: Introductionmentioning

confidence: 99%

“…42 Magnetic iron oxide particles coated in silica show increased resistance against oxidation. 62 Even with the insulating properties of silica, monoliths of SiO 2 -coated NCs have found applications in electronic devices such as light-emitting diodes 63,64 and photodetectors. 65 Another advantage of silica shell growth is that it turns a hydrophobic, organic ligand-passivated core particle into a hydrophilic, water-soluble particle.…”

Section: ■ Introductionmentioning

confidence: 99%

Improved Surface Passivation of Colloidal Ge_1–xSn_x Nanoalloys through Amorphous SiO₂ Shell Growth

Spera

Arachchige

2022

J. Phys. Chem. C

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Ge1– x Sn x alloy nanocrystals (NCs) are a class of semiconductors that show interesting (photo)physical properties such as composition-dependent visible to near-IR energy gaps and enhanced light–matter interactions compared to single element Ge NCs. With decreasing size and increasing Sn content, the molar absorptivity and emission efficiency increase, making these NCs attractive for optoelectronic, molecular imaging, and sensing studies. To further improve the optical stability, there is a need to passivate the Ge1– x Sn x surface with a robust shell material to protect the core from oxidation and inhibit chemical exchange when exposed to extreme environments. Herein, we report a fluent synthetic method for the growth of a thin silica layer on bulk-like (14.9 ± 1.7 nm) and quantum-confined (4.4 ± 0.6 nm) Ge1– x Sn x NCs. Physical characterization of Ge1– x Sn x /SiO2 core/shell NCs suggests that the diamond cubic structure of the core is retained upon shell growth, whereas solid-state and solution-state absorption spectra confirm the composition-dependent energy gap tunability. The core–shell NCs (1.23–2.07 eV for x = 0.03–0.09) show an average energy gap increase of 0.38 eV relative to the core NCs (0.91–1.67 eV for x = 0.03–0.09) owing to minor surface etching induced by shell growth. Surface analysis of core–shell NCs suggests a notable decrease in Ge2+ species and greater dominance of Ge0 species relative to the organically passivated Ge1– x Sn x core NCs, confirming the production of robust, oxidation-resistant, and optically stable Ge1– x Sn x /SiO2 alloy NCs.

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“…Although heavy-shelled InP/ZnSeS/ZnS QDs have suitable optical properties and eco-friendly elements, for application to display devices, its stability is vulnerable to humidity, light, and operation heat. − An additional protection process is indispensable for InP/ZnSeS/ZnS QDs to be applied to the more stable PL-based QD displays. To date, various protection approaches have been developed for InP-based QDs to improve the light, thermal, moisture, and operational stability, as summarized in Table . − ,− Quite recently, narrowly emissive, highly efficient, and highly stable Ga-treated InP/ZnSeS/ZnS QDs were successfully synthesized in Yang’s group . Ga treatment of the InP core is introduced to suppress the P-dangling bonds on the InP surface.…”

Section: Introductionmentioning

confidence: 99%

InP/ZnSeS/ZnS Quantum Dot-Embedded Alumina Microbeads for Color-by-Blue Displays

Ahn

Yoon

et al. 2022

ACS Appl. Nano Mater.

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Currently, heavy-shelled and gradient-shelled InP/ZnSeS/ZnS quantum dots (QDs) are commercially utilized as green (G) and red (R) color-converting layers in color-by-blue (B) QD-based displays. There is still a lack of systematic approaches to solve optical issues created when transforming QD nanoparticles into QD films. Here, triply protected approaches, such as using an Al dopant to passivate shell defects, Hf-nbutoxide (Hf(OtBu) 4 )-complex treatment to reduce ligand detachment, and the Al tri-sec-butoxide (Al(OsBu) 3 ) electrospray (E-spray) process to form an outer protecting layer and transform the material into QD-embedded Al 2 O 3 microbeads, are sequentially performed to improve the photoluminescence quantum yield (PLQY) and environmental stability of QDs. Moreover, QDembedded microbeads improve QD distribution uniformity inside Al 2 O 3 microbeads for high loading of nonagglomerated QDs and promote a scattering effect of QD green emission and blue excitation light in color-by-blue QD films. Therefore, the luminous efficacy (LE) of a mixed norland optical adhesive (NOA) film of QD@Al&Hf nanoparticles and QD@Al&Hf microbeads reaches ∼145.2 lm/W, which is 2.86 times higher than that of a QD@Al&Hf nanoparticle-only NOA film (50.8 lm/W). This combined approach can provide one example of promising combined approaches to fabrication of QD composite structures and suitable shapes for highly efficient and stable InP/ZnSeS/ZnS QD films in color-by-blue QD displays.

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Unconventional formation of dual-colored InP quantum dot-embedded silica composites for an operation-stable white light-emitting diode

Abstract: Using unconventionally formed silica composites embedded with both green and red InP/ZnSeS/ZnS QDs, an operation-stable, on-chip-packaged white light-emitting diode is demonstrated.

Cited by 19 publications

References 33 publications

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Improved Surface Passivation of Colloidal Ge_1–xSn_x Nanoalloys through Amorphous SiO₂ Shell Growth

InP/ZnSeS/ZnS Quantum Dot-Embedded Alumina Microbeads for Color-by-Blue Displays

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Unconventional formation of dual-colored InP quantum dot-embedded silica composites for an operation-stable white light-emitting diode

Abstract: Using unconventionally formed silica composites embedded with both green and red InP/ZnSeS/ZnS QDs, an operation-stable, on-chip-packaged white light-emitting diode is demonstrated.

Cited by 19 publications

References 33 publications

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Chemical Synthesis and Applications of Colloidal Metal Phosphide Nanocrystals

Improved Surface Passivation of Colloidal Ge1–xSnx Nanoalloys through Amorphous SiO2 Shell Growth

InP/ZnSeS/ZnS Quantum Dot-Embedded Alumina Microbeads for Color-by-Blue Displays

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Product

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Improved Surface Passivation of Colloidal Ge_1–xSn_x Nanoalloys through Amorphous SiO₂ Shell Growth