Lifetime Enhancement of a Circulated Cooling Perovskite Quantum Dots Colloidal Solution System for Laser Illuminations

Zong-Tao Li,Yu-Ling Hu,Xin-Rui Ding,Xue-Ting Tang,Yong Tang,Jia-Dong Yu,Bin Liu,Bin-Hai Yu

doi:10.1109/access.2019.2939589

Abstract

Perovskite quantum dots (QDs) attracted a lot of attention recently due to their high light conversion efficiency, and high color purity. However, perovskite materials are sensitive to heat. High temperature will cause serious quenching problem of the perovskite QDs. In order to solve the QDs thermal quenching problem without destroying their optical characters. A circulating quantum dots colloidal solution converter (CQD-converter) was developed. A closed loop pump tube coated with Teflon was utilized to prevent perovskite QDs from the external environment. A peristaltic pump was utilized to drive the QDs colloidal solution through a Peltier cooler for dissipating the heat of the QDs colloidal solution. The lifetime of the perovskite QDs can be significantly improved under a 450nm laser excitation. The effects of temperature of the Peltier cooler and flow velocity on the optical properties of QDs were also investigated. Compared to the static quantum dots colloidal solution (SQD-converter), which quenched after 7 min, the optical properties were maintained after 600 min for the CQD-converter.

Highlights

Perovskite quantum dots (QDs) (QDs) are widely used in battery [1], display [2], medical [3], [4], and biological fielids [5] because of tunable emission wavelength, high purity of color, wide absorption spectrum, narrow fluorescence spectrum, high stability, high quantum yield, and excellent solution processing ability [6]
We proposed a circulating quantum dots colloidal solution converter (CQD-converter) that avoids thermal quenching and improves the stability of laser-excited QDs illumination
The optical power of the green emission rises from 0.529 W to 0.712 W. This may be due to the Peltier cooler temperature drop, more heat produced by laser driving the CQD-converter is dissipated

Summary

INTRODUCTION

Perovskite QDs (QDs) are widely used in battery [1], display [2], medical [3], [4], and biological fielids [5] because of tunable emission wavelength, high purity of color, wide absorption spectrum, narrow fluorescence spectrum, high stability, high quantum yield, and excellent solution processing ability [6]. The above researches show optimizing QDs materials can improve QDs efficiency and improve stability Those methods are difficult to avoid the loss of stokes, and the heat production problem is still serious. Maintaining QDs in the colloidal solution is a way to effectively ensure conversion efficiency and improve QDs stability. QDs colloidal solution can improve the optical performance of the light-emitting device and improve thermal stability. For high-power laser illumination, due to the concentration of the laser beam and the concentration of energy, the single static QDs colloidal solution cannot transfer heat rapidly, and still cause thermal quenching of the QDs. In this work, we proposed a circulating quantum dots colloidal solution converter (CQD-converter) that avoids thermal quenching and improves the stability of laser-excited QDs illumination. Our work may inspire the application of QDs for high power laser lighting or display

EXPERIMENTAL

RESULT

Findings

CONCLUSION