Conformally deposited ZnS nanoparticle capping layers for precise emission control in red/green/blue top-emitting quantum dot light-emitting diodes
Year: 2026
Type: article
Abstract: Colloidal quantum dots are promising emitters for quantum dot light-emitting diodes (QLEDs), driving the development of optical strategies to enhance light outcoupling. In top-emitting architectures, capping layers (CPLs) enable precise microcavity control; however, conventional CPLs are typically vacuum-deposited, increasing fabrication complexity. Here, we demonstrate a solution-processed ZnS nanoparticle CPL that forms conformal films, enabling well-defined microcavity interference. Red, green, and blue (RGB) top-emitting QLEDs incorporating ZnS CPLs are systematically optimized, showing strong agreement with optical simulations. As a result, the devices achieve 2.08-, 1.52-, and 1.66-fold enhancements in external quantum efficiency for RGB QLEDs, along with improved angular color stability.
Source: Optics Express
DOI: 10.1364/oe.589865
Institutions: Sungkyunkwan University, Hongik University, Inha University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G1939739325, G5318276566, G6521687315
OpenAlex ID: W7129020811