Open AccessCataluminescence in Er‐Substituted Perovskites
Author(s) -
Borgschulte Andreas,
Sambalova Olga,
Billeter Emanuel,
Sterzi Andrea,
Niggli Jana,
Welte Bastian,
Heel André,
Holzner Reto
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202101764
Subject(s) - oxidizing agent , thermophotovoltaic , materials science , perovskite (structure) , energy conversion efficiency , energy transformation , stoichiometry , chemical energy , x ray photoelectron spectroscopy , chemical engineering , oxide , nanotechnology , chemistry , optoelectronics , common emitter , physics , organic chemistry , engineering , metallurgy , thermodynamics
Thermophotovoltaic devices have promising applications for energy conversion. However, current conversion efficiency of chemical energy to light is very low, limited by the competing process of heat dissipation released as black body radiation. From a fundamental point of view, the direct conversion of chemical energy into light without this detour is possible. This so called cataluminescence from methanol combustion over Er‐substituted SrTiO 3 with high efficiency is demonstrated. The catalytically active quaternary perovskites Er 0.15 La 0.15 Sr 0.55 Ti 0.95 Cu 0.05 O 3 − δ exsolute and reabsorb metallic Cu particles onto the surface in reducing and oxidizing conditions, respectively. Thus, it is able to manipulate the surface structure and investigate its influence on the catalytic as well as luminescent properties. The fuel to air ratio around the stoichiometry point changes the conditions from reducing to oxidizing and thereby alters the surface properties. This is evidenced by post mortem X‐ray diffraction and X‐ray photoemission as well as operando optical spectroscopy. Cataluminescence takes place under oxidizing conditions (lean fuel to air mixture) on the Er‐perovskite oxide with a strong selective near infrared emission, while reducing conditions stimulate formation of plasmonic Cu‐nanoparticles, which emit black body radiation.