Comprehensive analysis of photonic effects on upconversion of β-NaYF4:Er3+ nanoparticles in an organic-inorganic hybrid 1D photonic crystal

C. L. M. Hofmann; S. Fischer; C. Reitz; B. S. Richards; J. C. Goldschmidt

doi:10.1117/12.2227121

18 April 2016 Comprehensive analysis of photonic effects on up-conversion of β-NaYF₄:Er³⁺ nanoparticles in an organic-inorganic hybrid 1D photonic crystal

C. L. M. Hofmann, S. Fischer, C. Reitz, B. S. Richards, J. C. Goldschmidt

Author Affiliations +

Proceedings Volume 9885, Photonic Crystal Materials and Devices XII; 98851A (2016) https://doi.org/10.1117/12.2227121
Event: SPIE Photonics Europe, 2016, Brussels, Belgium

Abstract

Upconversion (UC) presents a possibility to exploit sub-bandgap photons for current generation in solar cells by creating one high-energy photon out of at least two lower-energy photons. Photonic structures can enhance UC by two effects: a locally increased irradiance and a modified local density of photon states (LDOS). Bragg stacks are promising photonic structures for this application, because they are straightforward to optimize and overall absorption can be increased by adding more layers. In this work, we present a comprehensive simulation-based analysis of the photonic effects of a Bragg stack on UC luminescence. The investigated organic-inorganic hybrid Bragg stack consists of alternating layers of Poly(methylmethacrylate) (PMMA), containing purpose-built β-NaYF4:25% Er³⁺ core-shell nanoparticles and titanium dioxide (TiO₂). From optical characterization of single thin layers, input parameters for simulations of the photonic effects are generated. The local irradiance enhancement and modulated LDOS are first simulated separately. Subsequently they are coupled in a rate equation model of the upconversion dynamics. Using the integrated model, UC luminescence is maximized by adapting the Bragg stack design. For a Bragg stack of only 5 bilayers, UC luminescence is enhanced by a factor of 3.8 at an incident irradiance of 2000 W/m2. Our results identify the Bragg stack as promising for enhancing UC, especially in the low-irradiance regime, relevant for the application in photovoltaics. Therefore, we experimentally realized optimized Bragg stack designs. The PMMA layers, containing UC nanoparticles, are produced via spin-coating from a toluene based solution. The TiO₂ layers are produced by atomic layer deposition from molecular precursors. The reflectance measurements show that the realized Bragg stacks are in good agreement with predictions from simulation.

Citation Download Citation

C. L. M. Hofmann, S. Fischer, C. Reitz, B. S. Richards, and J. C. Goldschmidt "Comprehensive analysis of photonic effects on up-conversion of β-NaYF₄:Er³⁺ nanoparticles in an organic-inorganic hybrid 1D photonic crystal", Proc. SPIE 9885, Photonic Crystal Materials and Devices XII, 98851A (18 April 2016); https://doi.org/10.1117/12.2227121

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available