The 2D Ruddlesden- Popper perovskite (EPEA)2PbI4 was investigated using temperature - and power -dependent PL and TA spectroscopy. This endeavor revealed the presence of multiple excitonic complexes in these materials, with signatures of carrier redistribution mediated by power and/or temperature, and the presence of extremely long-lived dark states in TA. These states appear to be light -induced defects which heal after illumination ceases. As such, they bring new insight into failure mechanisms and material design approaches in perovskite photovoltaics
Zero – dimensional (0D) hybrid organic – inorganic lead halides are receiving global attention because of their outstanding photophysical properties, tunable light emission properties, and relatively high photoluminescence quantum yields (PLQY). Despite these advances, the innate toxicity of lead and poor stability are obstacles for their large-scale commercialization. Here, we report a new, lead-free hybrid organic inorganic compound (C18H22N)InBr4. In this study, the organic precursor salt (C18H22NBr) was studied and compared to the hybrid compound (C18H22N)InBr4. We see a two-fold increase in the PLQY, and improved stability in the hybrid compound compared to the organic salt on its own.
Ternary group 11 halides, especially those utilizing copper (I), have recently been explored as relatively non-toxic alternatives to the popular luminescent lead halide perovskites. This talk will focus on one such family, A2CuX3 (A=Rb+, K+; X= Cl-, Br-), which exhibit outstanding light emission properties, with up to unity photoluminescent quantum yields. These samples, along with other ternary group 11 halides, have been investigated through an in-depth optical characterization. The ultrabright photoluminescence in the studied group 11 halides is ascribed to self-trapped excitons localized on the [CuX3]2- anionic substructure based on density functional theory (DFT) calculations and optical spectroscopy results.
Following the emergence of metal halide perovskites for optical and electronic applications, search for alternative non-toxic lead-free halides that demonstrate high environmental stability and excellent optoelectronic properties has accelerated. In this talk, our recent discoveries of brand-new families of high efficiency light-emitting materials based on all-inorganic copper halides will be summarized. These all-inorganic copper(I) halides demonstrate low-dimensional non-perovskite structures, and consequently, very flat bands around the band gap, leading to very localized charges. Such charge localization and low-dimensional structures typically result in the presence of high stability self-trapped excitons at room temperature producing record high photoluminescence efficiencies approaching unity. Our preliminary studies of the potential practical applications of these luminescent copper halides will also be discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.