Experimental and theoretical investigation of 2D nanoplatelet-based conversion layers for color LED microdisplays

Autor: Quesnel, E., Suhm, A., Consonni, M., Reymermier, M., Lorin, G., Laugier, C., Tournaire, M., Le Maitre, P., Lagrange, A., Racine, B., D’Amico, M., Cao, E.
Přispěvatelé: Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA/DRT/LITEN, NEXDOT, European Project: 755497,Hilico, Nexdot
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Optics Express
Optics Express, Optical Society of America-OSA Publishing, 2021, 29 (13), pp.20498. ⟨10.1364/oe.425907⟩
Optics Express, 2021, 29 (13), pp.20498. ⟨10.1364/oe.425907⟩
ISSN: 1094-4087
Popis: International audience; In the field of augmented reality, there is a need for very bright color microdisplays to meet the user specifications. Today, one of the most promising technology to manufacture such displays involves a blue micro-LED technology and quantum dots-based color conversion layers. Despite recent progress, the external power conversion efficiencies (EPCE) of these layers remain under ∼25%, below the needs (>40%) to reach a white luminance of 100,000 cd/m$^2$. In this work, we have synthesized CdSe$_x$S$_{1-x}$ nanoplatelet-based conversion layers for red and green conversion, and measured their absorption properties and EPCE performances with respect to layer thickness. On this basis, a model was developed that reliably predicts the layer EPCE while using only few input data, namely the layer absorption coefficients and the photoluminescence quantum yield (PLQY) of color photoresist. It brings a new insight into the conversion process at play at a micro-LED level and provides a simple method for extensive optimization of conversion materials. Finally, this study highlights the outstanding red conversion efficiency of photoresist layers made of core-double shell CdSe$_x$S$_{1-x}$ nanoplatelets with 31% EPCE (45% external PLQY) for 8 µm-thick conversion layer.
Databáze: OpenAIRE
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