Long-Lived Charge-Transfer State from B–N Frustrated Lewis Pairs Enchained in Supramolecular Copolymers
摘要:
The field of supramolecular polymers is rapidly expanding; however, the exploitation of these systems as functional materials is still elusive. To become competitive, supramolecular polymers must display microstructural order and the emergence of new properties upon copolymerization. To tackle this, a greater understanding of the relationship between monomers' design and polymer microstructure is required as well as a set of functional monomers that efficiently interact with one another to synergistically generate new properties upon copolymerization. Here, we present the first implementation of frustrated Lewis pairs into supramolecular copolymers. Two supramolecular copolymers based on p-conjugated O-bridged triphenylborane and two different triphenylamines display the formation of B-N pairs within the supramolecular chain. The remarkably long lifetime and the circularly polarized nature of the resulting photoluminescence emission highlight the possibility to obtain an intermolecular B-N charge transfer. These results are proposed to be the consequences of the enchainment of B-N frustrated Lewis pairs within 1D supramolecular aggregates. Although it is challenging to obtain a precise molecular picture of the copolymer microstructure, the formation of random blocklike copolymers could be deduced from a combination of optical spectroscopic techniques and theoretical simulation.
were designed and synthesized as hole‐transporting materials. X‐ray structural analyses revealed that these compounds form on‐top π‐stacking aggregates in the crystalline state. TRMC measurements showed that high levels of anisotropic charge transport were induced in the direction of the π‐stacking. Surprisingly, even in vacuum‐deposited amorphousfilms, these compounds retained some of the face‐on π‐stacking
BICARBAZOLE COMPOUND, MATERIAL FOR ORGANIC LIGHT-EMITTING DEVICE INCLUDING BICARBAZOLE COMPOUND, AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING BICARBAZOLE COMPOUND
申请人:SAMSUNG ELECTRONICS CO., LTD.
公开号:US20170183360A1
公开(公告)日:2017-06-29
A bicarbazole compound represented by Formula 1:
[Ar
1
]
n1
-(L
1
)
a1
-[Ar
2
]
n2
Formula 1
wherein in Formula 1, a1, Ar
1
, Ar
2
, L
1
, n1, and n2 are the same as described in the specification.
A new alkynyl Au(I) carbene complex with tunable electronic structure shows high efficiency thermallyactivatedfluorescence (TADF). Solution-processed OLEDs made with these complexes achieve high external quantum efficiencies (EQEs) of up to 20.4 %, manifesting the bright prospect of Au(I)-TADF emitters in OLEDs.
Doping a monovalent Au-carbene complex into a boron-embedded molecular host has resulted in a host–guest system showing long-persistent luminescence (LPL), thus illustrating that third-row transition metals can be used to achieve LPL. The introduction of a chiral unit on the guest molecule provides a simple approach to obtain circularly polarized LPL multifunctional materials.