Colloidal Quantum Dot LEDs Package with Porous Microcarrier

The porous structured microcarrier powders were mixed with CQD/PDMS packages to improve the dispersion of CQD particles. When the traditional package suffers seriously in efficiency at high CQD loading, the microcarrier ones sustain its performance and win out.

1. Introduction

Colloidal quantum dots (CQD) have attracted much attention due to their high quantum yield, narrow line width and numerous emission colors. The high luminous efficiency of CQD can be used in a wide range of photonic device applications, such as solar cells, displays, and light-emitting diodes (LEDs) [1] - [3]. However, the self-aggregation and CQD photon reabsorption reduce the efficiency with the increasing amount of CQD [4], [5]. In this study, high dosage CQDs are mixed with collagen-based microcarriers in order to prevent from the aforementioned problems. Microcarriers are powders with three-dimensional cell structures and made of collagen materials. With this unique holey structure in microcarriers, CQDs are expected to suffer less from the aggregation in the high concentration [6]. A baseline microcarrier-free package is compared to two different packages containing microcarriers by the photonic characterization. We believe this study can provide useful information to improve luminous efficiency for the CQD photonic devices in the future.