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Active Tuning of Optical Constants in the Visible–UV: Praseodymium-Doped Ceria—a Model Mixed Ionic–Electronic Conductor

Journal Article · · Advanced Optical Materials
 [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Institute of Technology
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Mixed ionic-electronic conductors offer chemical and electrical means for active tuning of their optical constants, e.g. with variations in oxygen non-stoichiometry in Pr0.1Ce0.9O2-δ, enabling implementation of adaptive thin film optical devices. Here, we demonstrate in-situ chemo-tuning of the extinction coefficient in Pr0.1Ce0.9O2-δ at elevated temperatures and provide a tuning model that treats the interdependence of mobile oxygen vacancies and small polarons coupled to variations in optically active praseodymium ions. Further, a new means for electro-tuning of the optical constants of mixed ionic-electronic conductors was demonstrated experimentally and modeled for Pr0.1Ce0.9O2-δ thin films deposited on grid-like electrode structures. Modeling of non-steady state optical transmittance modulations in the latter allows for estimation of oxygen vacancy mobility that determines the switching speed of the device. Quenched-in values of nr and k to room temperature become nonvolatile, providing a modulation range in the extinction coefficient of Δk ~0.1 (change of ~800%) and in the refractive index of Δnr ~0.1 (relative to initial nr of ~2.35). Key figures of merit including, transmission optical modulation of ~0.04 per 1 mV nm-1, switching energy per area of 670 pJ μm-2 and switching times of seconds, were demonstrated, with further improvements possible.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0002633
OSTI ID:
1777121
Alternate ID(s):
OSTI ID: 1804229
Journal Information:
Advanced Optical Materials, Journal Name: Advanced Optical Materials Journal Issue: 6 Vol. 9; ISSN 2195-1071
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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