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Two-dimensional-lattice-confined single-molecule-like aggregates

Journal Article · · Nature (London)
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [5];  [2];  [2];  [2];  [5];  [4];  [2];  [2];  [3];  [2];  [2]
  1. Purdue University, West Lafayette, IN (United States); Chinese Academy of Sciences, Beijing (China)
  2. Purdue University, West Lafayette, IN (United States)
  3. Yale University, New Haven, CT (United States); Yale University, West Haven, CT (United States)
  4. Chinese Academy of Sciences, Beijing (China)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Intermolecular distance largely determines the optoelectronic properties of organic matter. Conventional organic luminescent molecules are commonly used either as aggregates or as single molecules that are diluted in a foreigner matrix. They have garnered great research interest in recent decades for a variety of applications, including light-emitting diodes, lasers and quantum technologies, among others. However, there is still a knowledge gap on how these molecules behave between the aggregation and dilution states. Here we report an unprecedented phase of molecular aggregate that forms in a two-dimensional hybrid perovskite superlattice with a near-equilibrium distance, which we refer to as a single-molecule-like aggregate (SMA). By implementing two-dimensional superlattices, the organic emitters are held in proximity, but, surprisingly, remain electronically isolated, thereby resulting in a near-unity photoluminescence quantum yield, akin to that of single molecules. Moreover, the emitters within the perovskite superlattices demonstrate strong alignment and dense packing resembling aggregates, allowing for the observation of robust directional emission, substantially enhanced radiative recombination and efficient lasing. Molecular dynamics simulations together with single-crystal structure analysis emphasize the critical role of the internal rotational and vibrational degrees of freedom of the molecules in the two-dimensional lattice for creating the exclusive SMA phase. Furthermore, this two-dimensional superlattice unifies the paradoxical properties of single molecules and aggregates, thus offering exciting possibilities for advanced spectroscopic and photonic applications.
Research Organization:
Purdue University, West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); Air Force Office of Scientific Research (AFOSR); Office of Naval Research (ONR)
Grant/Contract Number:
EE0009519
OSTI ID:
2474941
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 8030 Vol. 633; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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