High Luminescence in Layered Double Perovskite via Formation of Terbium Intercalation Complex

Abstract

As the field of perovskite emerges, doping presents an optimistic way to upgrade the functionalities of these materials and improve the photoluminescence quantum yield (PLQY). While doping is well‐explored in perovskites, it has received less attention in layered double perovskites (LDPs). Doping with lanthanides is particularly interesting for these wide bandgap materials because of their narrow and intense luminescence spectra. Here, the doping of (PEA)4NaInCl8 LDP (PEA = Phenylethylammonium) with Tb3+ and complex of Tb3+ with hexafluoroacetylacetonate (hfa) is studied, i.e., tetrakis β‐diketonate complex. In both cases, energy transfer from host to dopant leading to photoluminescence (PL) emission due to Tb3+ f‐f transitions is observed. However, in the case of Tb3+ doping, sensitization is not very efficient due to the nonideal alignment of energy levels of the host and resonance acceptor energy levels of Tb3+. Whereas, doping of (PEA)4NaInCl8 with Tb3+ in the form of hfa complex, provides a more ideal energetic environment for the efficient energy transfer from host to Tb3+ in the LDP matrix, resulting in a 20‐fold enhancement in the luminescence efficiency. The doping of Tb3+ and Tb3+ complex in LDP sets the foundation for a new approach for the synthesis of LDPs‐lanthanide host‐guest systems for high PLQY.

Broad Dual Emission from Cs2Zr1–xMoxCl6: Enhancing the NIR Emission in Lead-free Vacancy Ordered Double Perovskites

“…Doping strategy has emerged as a crucial method for fine-tuning of the optical, electronic, thermal, and magnetic properties of these metal halides, thereby circumventing their previous limitations. In this regard, various n s 2 metal ions Sb 3+ , Te 4+ , Bi 3+ , and d-, f-electron ions Cr 3+ , Yb 3+ , Tb 3+ , Sm 3+ , and Er 3+ have been established as effective dopants for various metal halide perovskites, which produces a series of highly efficient green-, blue-, yellow- and red-light emitting materials. ,− In these materials, achieving efficient NIR luminescence and dual emission in a single crystal is still challenging due to the lack of luminescent centers that can harvest the excitation light efficiently and emit photons in the NIR region. ,, Phosphors with broad dual band emission that improve color-rendering performance are needed to fabricate lighting devices like LEDs . However, dopant-induced transitions mainly dominate the emission in most of the doped material due to host lattice and dopant interaction, so 0D perovskite material can be potential candidate for tunable dual emission in the single crystal due to its electronically decoupled structure.…”

Chemical Control of Optical Band Gap and Magnetic Properties in Fe-Alloyed Na–In Halide Layered Perovskites

“…The organic layers are formed by a monovalent aliphatic or aromatic ammonium cation A′ that separates the inorganic layers while maintaining the charge neutrality. The inorganic layers are composed of corner-sharing octahedra of [MX 6 ] 5– and [M′X 6 ] 3– , where M is some monovalent metal like Na, Ag, or Cu and M ′ is Bi, Sb, In, or some trivalent metal ion, while X is the halide anion. − …”