In
the quest for new functional materials, Mn2+-activated
metal halide perovskites (MHPs) were found to possess remarkable optical
properties. However, they show low photoluminescence quantum yield
(PLQY) and weak thermal stability. This is due to weak dopant–host
interactions and strong phonon–lattice coupling at high temperatures
of MHPs. Developing Mn2+-activated MHPs with a high PLQY
and good thermal stability has become a highly versatile research
area to meet current needs. Herein, we synthesized Mn2+ ion-activated Rb3(Cd1–x
Mn
x
)2Cl7 layered
metal halide perovskite (LMHP) and solved its crystal structure using
direct methods. The Rb3(Cd1–x
Mn
x
)2Cl7 LMHP
exhibits an orange emission with a high PLQY of 88%, the highest among
Mn2+-activated MHPs. Moreover, Rb3(Cd0.80Mn0.20)2Cl7 exhibits a zero-thermal-quenching
(TQ) behavior, which is considered the first for the MHP family. Therefore,
our results could pave the way for a search for new LMHPs with zero-TQ
behavior for high-power optoelectronic applications.
White‐light‐emitting single‐component materials are in high demand for lighting applications. However, achieving white light in single‐doped metal halide materials remains a challenge. Herein, for the first time, zero‐dimensional Cs3ScCl6:Sb3+(CSC:Sb3+) nanocrystals (NCs) are reported that exhibit bright white‐light emission, which is a result of combination of the excessive blue and yellow emissions of carbon dots and spin‐forbidden electronic transitions of Sb3+ ions. CSC:Sb3+ NCs exhibit a high photoluminescence quantum yield of 48%. Furthermore, they retain 75% of their original photoluminescence efficiency at 100 °C. This high thermal stability is mainly attributed to its lower dimensionality and high exciton binding energy as they facilitate the creation of stable white light at elevated temperatures. A single‐component white‐light‐emitting diode fabricated using CSC:Sb3+ NCs exhibits a high‐color rendering index and luminous efficacy values of 90 and 23 lm W−1 at a high flux current of 200 mA. Therefore, the findings may pave the way for developing the next generation of white‐light‐emitting devices using a single component of white‐light‐emitting material.
A polymer/small-molecule binary-blend hole transport layer provided balanced charge transport and efficient recombination of electrons and holes in the perovskite layer, and an optimal device based on the blended HTL shows the highest EQE of 5.30%.
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