Highly stable and pure single-photon emission with 250 ps optical coherence times in InP colloidal quantum dots

Proppe, Andrew H.; Berkinsky, David B.; Zhu, Hua; Šverko, Tara; Kaplan, A. E.; Horowitz, Jonah; Kim, Taehyung; Chung, Heejae; Jun, Sangmi; Bawendi, Moungi G.

doi:10.1038/s41565-023-01432-0

Cited by 37 publications

(19 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase in efficiency depends on the refractive index of the SiO 2 shell, with a more pronounced enhancement observed for quartz (n in = 1.45) and a diminished one for glass (n in = 1.3). Such behavior arises from the out-coupling efficiency dependence on ε in 3 , meaning that the efficiency is higher when the refractive index is higher. Physically, increasing the refractive index of the dielectric sphere produces an increase in the emitted radiation momentum density (i.e., the Poynting vector), thus enhancing the emitted power outside the dielectric-coated NC.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Fiorito,

Silvestri,

Cirignano

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The growth of SiO 2 shells on semiconductor nanocrystals is an established procedure and it is widely employed to provide dispersibility in polar solvents, and increased stability or biocompatibility. However, to exploit this shell to integrate photonic components on semiconductor nanocrystals, the growth procedure must be finely tunable and able to reach large particle sizes (around 100 nm or above). Here, we demonstrate that these goals are achievable through a design of experiment approach. Indeed, the use of a sequential full-factorial design allows us to carefully tune the growth of SiO 2 shells to large values while maintaining a reduced size dispersion. Moreover, we show that the growth of a dielectric shell alone can be beneficial in terms of emission efficiency for the nanocrystal. We also demonstrate that, according to our modeling, the subsequent growth of two shells with increasing refractive index leads to an improved emission efficiency already at a reduced SiO 2 sphere radius.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Fiorito,

Silvestri,

Cirignano

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Precise chemical designs and in-depth mechanistic studies are essential to drive the synthesis of colloidal semiconductor quantum dots (QDs) from an empirical art to science. − Direct synthesis strategies, such as hot-injection and hydrothermal methods, have been the most effective techniques for solution-based synthesis of high-quality monodisperse QDs over the past few decades. − Recent developments have shown that postsynthesis strategies can also enrich the avenues for nanomaterial synthesis and are particularly suitable for obtaining synthetically challenging nanomaterials with higher diversity and more advanced functionality. − …”

Section: Introductionmentioning

confidence: 99%

Anion Exchange in Semiconductor Magic-Size Clusters

Kong,

Deng,

Zou

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

Ion exchange is an effective postsynthesis strategy for the design of colloidal nanomaterials with unique structures and properties. In contrast to the rapid development of cation exchange (CE), the study of anion exchange is still in its infancy and requires an in-depth understanding. Magic-size clusters (MSCs) are important reaction intermediates in quantum dot (QD) synthesis, and studying the ion exchange processes can provide valuable insights into the transformations of QDs. Here, we achieved anion exchange in Cd-based MSCs and elucidated the reaction pathways. We demonstrated that the anion exchange was a stepwise intermolecular transition mediated by covalent inorganic complexes (CICs). We proposed that this transition involved three essential steps: the disassembly of CdE 1 -MSCs into CdE 1 -CICs (step 1), an anion exchange reaction from CdE 1 -CICs to CdE 2 -CICs (step 2), and assembly of CdE 2 -CICs to CdE 2 -MSCs (step 3). Step 3 was the rate-determining step and followed first-order reaction kinetics (k obs = 0.01 min −1 ; from CdSe-MSCs to CdS-MSCs). Further studies revealed that the activity of foreign anions only affected the reaction kinetics without altering the reaction pathway. The present study provides a deeper insight into the anion exchange mechanisms of MSCs and will further shed light on the synthesis of QDs.

show abstract

“…Simple, cost-effective integration of colloidal semiconductor quantum emitters onto chip-based devices has gained substantial momentum owing to its potential to revolutionize optoelectronic and quantum photonic technologies. − Serving as both efficient light harvesting agents and solid-state emitters, quantum dots (QDs) have emerged as a pivotal nanomaterial with desirable capabilities, including exceptional tunability of optical and electrical properties, high quantum yield, and flexible compatibility with on-chip integration. Nonetheless, their low spontaneous emission rate (∼100 MHz) and rapid dephasing hinder high-speed quantum photonic applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocurrent and Electrically Pumped Quantum Dot Emission from Single Plasmonic Nanoantennas

Huang,

Hu,

Kos

et al. 2024

ACS Nano

View full text Add to dashboard Cite

Integrating cavity-enhanced colloidal quantum dots (QDs) into photonic chip devices would be transformative for advancing roomtemperature optoelectronic and quantum photonic technologies. However, issues with efficiency, stability, and cost remain formidable challenges to reach the single antenna limit. Here, we present a bottom-up approach that delivers single QD-plasmonic nanoantennas with electrical addressability. These QD nanojunctions exhibit robust photoresponse characteristics, with plasmonically enhanced photocurrent spectra matching the QD solution absorption. We demonstrate electroluminescence from individual plasmonic nanoantennas, extending the device lifetime beyond 40 min by utilizing a 3 nm electron-blocking polymer layer. In addition, we reveal a giant voltagedependent redshift of up to 62 meV due to the quantum-confined Stark effect and determine the exciton polarizability of the CdSe QD monolayer to be 4 × 10 −5 meV/(kV/cm) 2 . These developments provide a foundation for accessing scalable quantum light sources and highspeed, tunable optoelectronic systems operating under ambient conditions.

show abstract

Highly stable and pure single-photon emission with 250 ps optical coherence times in InP colloidal quantum dots

Cited by 37 publications

References 61 publications

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Anion Exchange in Semiconductor Magic-Size Clusters

Enhanced Photocurrent and Electrically Pumped Quantum Dot Emission from Single Plasmonic Nanoantennas

Contact Info

Product

Resources

About

Highly stable and pure single-photon emission with 250 ps optical coherence times in InP colloidal quantum dots

Cited by 37 publications

References 61 publications

Controlled Growth of Large SiO2 Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Controlled Growth of Large SiO2 Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Anion Exchange in Semiconductor Magic-Size Clusters

Enhanced Photocurrent and Electrically Pumped Quantum Dot Emission from Single Plasmonic Nanoantennas

Contact Info

Product

Resources

About

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

Controlled Growth of Large SiO₂ Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration