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Core-Shell Perovskite Quantum Dots for Highly Selective Room-Temperature Spin Light-Emitting Diodes.

Gyumin Jang¹, Dae-Yeon Jo², Sunihl Ma^1,3

¹Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)

|November 24, 2023

Summary

Researchers developed core-shell perovskite quantum dots for room-temperature spin-LEDs. These devices emit circularly polarized light (CPL) via chiral-induced spin selectivity, showing potential for advanced displays.

Keywords:

chiral-induced spin selectivity core-shell nanocrystals perovskite spin-LEDs

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Area of Science:

Materials Science
Optoelectronics
Quantum Dot Technology

Background:

Circularly polarized light (CPL) is vital for applications like magnetic recording and 3D displays.
Perovskite quantum dots (QDs) offer tunable optoelectronic properties but require enhanced spin polarization for advanced applications.

Purpose of the Study:

To develop core-shell heterostructured perovskite QDs for room-temperature spin-polarized light-emitting diodes (spin-LEDs).
To leverage the chiral-induced spin selectivity (CISS) effect for efficient CPL emission.

Main Methods:

Fabrication of 2D chiral perovskite shells on achiral 3D CsPbBr3 QD cores.
Utilizing (R)- and (S)-1-(2-(naphthyl)ethylamine) (R-/S-NEA) chiral cations.
Defect analysis and characterization of photoluminescence quantum yield (PLQY).
Fabrication and testing of spin-LED devices and inkjet-printed patterns.

Main Results:

Demonstrated CISS effect leading to spin-polarized carrier injection and CPL emission.
Achieved high PLQY of 78% due to defect passivation by R-/S-NEA cations.
Obtained maximum external quantum efficiency of 5.47% and a polarization degree (P_CP-EL) of 12% in spin-LEDs.
Showcased inkjet-printable CPL-emitting patterns.

Conclusions:

Core-shell perovskite QDs with chiral shells effectively generate CPL at room temperature.
The developed spin-LEDs exhibit promising performance for next-generation display technologies.
Chiral cation passivation is crucial for high PLQY and efficient spin polarization.