4.8 Article

Effectual Interface and Defect Engineering for Auger Recombination Suppression in Bright InP/ZnSeS/ZnS Quantum Dots

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 10, 页码 12479-12487

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c20088

关键词

auger recombination; confinement potential smoothing; lifetime blinking; gradient shell; InP quantum dots

资金

  1. National Research Foundation of Korea (NRF) - Korean government (MSIT) [2021R1A2C300630811]
  2. Ministry of Trade, Industry & Energy (MOTIE, Korea) [20010737]

向作者/读者索取更多资源

This study investigates the effects of shell structure and composition on photoluminescence properties of quantum dots. It discovers that gradient shells can effectively suppress nonradiative Auger recombination and improve the luminescence of the dots. Single-dot measurements show that gradient shells reduce spectral diffusion and enhance the energy barrier for charge trapping.
The main issue in developing a quantum dot light-emitting diode (QLED) display lies in successfully replacing heavy metals with environmentally benign materials while maintaining high-quality device performance. Nonradiative Auger recombination is one of the major limiting factors of QLED performance and should ideally be suppressed. This study scrutinizes the effects of the shell structure and composition on photoluminescence (PL) properties of InP/ZnSeS/ZnS quantum dots (QDs) through ensemble and single-dot spectroscopic analyses. Employing gradient shells is discovered to suppress Auger recombination to a high degree, allowing charged QDs to be luminescent comparatively with neutral QDs. The lifetime blinking phenomenon is observed as evidence of suppressed Auger recombination. Furthermore, single-QD measurements reveal that gradient shells in QDs reduce spectral diffusion and elevate the energy barrier for charge trapping. Shell composition dependency in the gradience effect is observed. An increase in the ZnS composition (ZnS >50%) in the gradient shell introduces lattice mismatch between the core and the shell and therefore rather reverses the effect and reduces the QD performance.

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