Anion-Exchange Blue Perovskite Quantum Dots for Efficient Light-Emitting Devices

Wei-Kuan Hung; Yi-Hsun Tseng; Chun-Cheng Lin; Sih-An Chen; Chih-Hung Hsu; Chen-Feng Li; Yen-Ju Chen; Zong-Liang Tseng

doi:10.3390/nano12223957

Anion-Exchange Blue Perovskite Quantum Dots for Efficient Light-Emitting Devices

Nanomaterials (Basel). 2022 Nov 10;12(22):3957. doi: 10.3390/nano12223957.

Authors

Wei-Kuan Hung¹, Yi-Hsun Tseng¹, Chun-Cheng Lin², Sih-An Chen^{1

2}, Chih-Hung Hsu³, Chen-Feng Li¹, Yen-Ju Chen⁴, Zong-Liang Tseng⁴

Affiliations

¹ Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan.
² Department of Mathematic and Physical Sciences, General Education, R.O.C. Air Force Academy, Kaohsiung 820009, Taiwan.
³ Giant-Tek Corporation, Miaoli 35048, Taiwan.
⁴ Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 243303, Taiwan.

Abstract

In this study, blue perovskite quantum dots (PQDs) were prepared using didodecyldimethylammonium bromide (DDAB), which can passivate surface defects caused by the loss of surface ligands and reduce particle size distribution. After the passivation of DDAB, blue CsPbCl_xBr_3-x PQDs dispersed in n-octane produced a more compact and uniform PQD thin film than the non-passivated ones. The resulting device showed a stabile lifetime, and an EL peak of 470 nm and a maximum EQE of 1.63% were obtained at an operating voltage of 2.6 V and a current density of 0.34 mA/cm². This work aims to provide a simple method to prepare blue-emitting PQDs and high-performance PQD-based light-emitting devices.

Keywords: energy efficiency; light-emitting diodes (LED); nanoparticle (NP); perovskite; quantum-dot (QD).

Grants and funding

This work was supported by the National Science and Technology Council (NSTC), Taiwan, under Grant No. NSTC 111-2221-E-131-031.