Strain-graded quantum dots with spectrally pure, stable and polarized emission

Dongju Jung, Jeong Woo Park, Sejong Min, Hak June Lee, Jin Su Park, Gui-Min Kim, Doyoon Shin, Seongbin Im, Jaemin Lim, Ka Hyung Kim, Jong Ah Chae, Doh C. Lee, Raphaël Pugin, Xavier Bulliard (), Euyheon Hwang, Ji-Sang Park (), Young-Shin Park () and Wan Ki Bae ()
Additional contact information
Dongju Jung: Sungkyunkwan University (SKKU)
Jeong Woo Park: Sungkyunkwan University (SKKU)
Sejong Min: Sungkyunkwan University (SKKU)
Hak June Lee: Sungkyunkwan University (SKKU)
Jin Su Park: Sungkyunkwan University (SKKU)
Gui-Min Kim: Korea Advanced Institute of Science and Technology (KAIST)
Doyoon Shin: Sungkyunkwan University (SKKU)
Seongbin Im: Sungkyunkwan University (SKKU)
Jaemin Lim: Sungkyunkwan University (SKKU)
Ka Hyung Kim: Sungkyunkwan University (SKKU)
Jong Ah Chae: Sungkyunkwan University (SKKU)
Doh C. Lee: Korea Advanced Institute of Science and Technology (KAIST)
Raphaël Pugin: Centre Suisse d’Electronique et de Microtechnique (CSEM SA)
Xavier Bulliard: Centre Suisse d’Electronique et de Microtechnique (CSEM SA)
Euyheon Hwang: Sungkyunkwan University (SKKU)
Ji-Sang Park: Sungkyunkwan University (SKKU)
Young-Shin Park: Los Alamos National Laboratory
Wan Ki Bae: Sungkyunkwan University (SKKU)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Structural deformation modifies the bandgap, exciton fine structure and phonon energy of semiconductors, providing an additional knob to control their optical properties. The impact can be exploited in colloidal semiconductor quantum dots (QDs), wherein structural stresses can be imposed in three dimensions while defect formation is suppressed by controlling surface growth kinetics. Yet, the control over the structural deformation of QDs free from optically active defects has not been reached. Here, we demonstrate strain-graded CdSe-ZnSe core-shell QDs with compositionally abrupt interface by the coherent pseudomorphic heteroepitaxy. Resulting QDs tolerate mutual elastic deformation of varying magnitudes at the interface with high structural fidelity, allowing for spectrally stable and pure emission of photons at accelerated rates with near unity luminescence efficiency. We capitalize on the asymmetric strain effect together with the quantum confinement effect to expand emission envelope of QDs spanning the entire visible region and exemplify their use in photonic applications.

Date: 2024
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DOI: 10.1038/s41467-024-49791-z

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