Extending the π‐Skeleton of Multi‐Resonance TADF Materials towards High‐Efficiency Narrowband Deep‐Blue Emission
摘要:
AbstractMulti‐resonance TADF (MR‐TADF) emitters are promising for high‐resolution OLEDs, but the concurrent optimization of excited‐state dynamics and color purity remains a tough challenge. Herein, three deep‐blue MR‐TADF compounds (BN1–BN3) featuring gradually enlarged ring‐fused structures and increased rigidity are accessed by lithium‐free borylation in high yields from the same precursor, with all the emitters possessing CIEy coordinates below 0.08. Structure–property investigations demonstrate a strategic improvement of the oscillator strength (fosc) and acceleration of the reverse intersystem crossing (RISC) process by extending the π‐skeleton, where BN3 realizes a maximum external quantum efficiency (EQE) of 37.6 % and reduced roll‐off, thus showing the best efficiency reported for deep‐blue TADF OLEDs. The internal regulation of the efficiency and color purity of these compounds validate the general effectiveness to achieve advanced deep‐blue narrowband emitters with higher‐order boron/nitrogen‐based MR motifs.
Luminescent Platinum(II) Complexes with Bidentate Diacetylide Ligands: Structures, Photophysical Properties and Application Studies
作者:Zaoli Luo、Yungen Liu、Ka‐Chung Tong、Xiao‐Yong Chang、Wai‐Pong To、Chi‐Ming Che
DOI:10.1002/asia.202100756
日期:2021.10.4
A series of platinum(II) complexes supported by terphenyl diacetylide as well as diimine or bis-N-heterocyclic carbene (NHC) ligands have been prepared. The diacetylide ligands adopt a cis coordination mode featuring non-planar terphenyl moieties. Furthermore, the electrochemical, photophysical and photochemical properties of these platinum(II) complexes have been investigated.
已经制备了一系列由三联苯二乙炔以及二亚胺或双-N-杂环卡宾 (NHC) 配体负载的铂 (II) 配合物。二乙炔配体采用顺式配位模式,具有非平面的三联苯部分。此外,还研究了这些铂 (II) 配合物的电化学、光物理和光化学性质。
[EN] AROMATIC MONOMER-AND CONJUGATED POLYMER-METAL COMPLEXES<br/>[FR] COMPLEXES METALLIQUES A BASE DE MONOMERE AROMATIQUE ET DE POLYMERE CONJUGUE
申请人:DOW GLOBAL TECHNOLOGIES INC
公开号:WO2005016945A1
公开(公告)日:2005-02-24
A halogenated aromatic monomer-metal complex useful for preparing a polymer for electronic devices such as a light-emitting diode (LED) device is described. The aromatic monomer-metal complex is designed to include a linking group that disrupts conjugation, thereby advantageously reducing or preventing electron delocalization between the aromatic monomer fragment and the metal complex fragment. Disruption of conjugation is often desirable to preserve the phosphorescent emission properties of the metal complex in a polymer formed from the aromatic monomer-metal complex. The resultant conjugated electroluminescent polymer has precisely controlled metal complexation and electronic properties that are substantially or completely independent of those of the polymer backbone.