5H,9H-[1,4]Benzazaborino[2,3,4-kl]phenazaborine, 2,12-bis(1,1-dimethylethyl)-5,9-bis[4-(1,1-dimethylethyl)phenyl]-7-methyl- Cas:1805802-42-9_NEWs

Introduction:
5H,9H-[1,4]Benzazaborino[2,3,4-kl]phenazaborine, 2,12-bis(1,1-dimethylethyl)-5,9-bis[4-(1,1-dimethylethyl)phenyl]-7-methyl- CAS:1805802-42-9 identifies a complex boron‑nitrogen heteroatom polycyclic aromatic hydrocarbon (B‑N PAH) . 
It is bright yellow powder and The compound is a pure organic molecule supplied with a typical purity of not less than 99.5% sublimed and is classified among OLED materials. 
It represents a cutting‑edge molecular design where a boron‑nitrogen hybridisation strategy is employed to achieve both high efficiency and high colour purity in organic LEDs. Ongoing research directions include:
- Extending the π‑conjugation to shift emission further into the deep‑blue or into the red part of the spectrum;  -Introducing multiple boron centres in the same molecule to create even narrower emission bands (ultra‑pure colours)
-Developing solution‑processable derivatives by modifying the tert‑butyl groups or adding solubilising side chains for low‑cost printed electronics.
-Exploring non‑OLED applications such as organic field‑effect transistors (OFETs), organic photovoltaics (OPVs), and bioimaging probes, exploiting the intense fluorescence and photostability of B‑N PAHs

Electronic Properties:
--Donor–acceptor character
The central boron atom has an empty p‑orbital, which acts as a strong electron acceptor in the conjugated system. The adjacent nitrogen atoms, on the contrary, are electron‑rich and behave as electron donors. 
This alternating arrangement of electron‑poor (boron) and electron‑rich (nitrogen) centres within the same rigid plane generates a strong intramolecular charge transfer (ICT) from the donor nitrogens toward the acceptor boron.
Because both the donor and the acceptor sites are integrated into the same π‑framework without external bridging units, the charge transfer is highly efficient and directionally controllable.
--Energy levels
The strong electron‑withdrawing effect of the empty boron p‑orbital significantly lowers the lowest unoccupied molecular orbital (LUMO) energy of the molecule, granting it a high electron affinity and good electron‑transporting capability. 
At the same time, the electron‑rich nitrogen atoms and the extended aromatic rings provide effective hole‑transporting properties, leading to balanced bipolar charge transport.
The combination of a rigid, highly planar π‑core and the D–A–D character results in an unusually small singlet‑triplet energy gap (ΔEₛₜ), a key prerequisite for the thermally activated delayed fluorescence (TADF) mechanism described below.

Applications in Organic Electronics:
--Thermally activated delayed fluorescence (TADF)
The compound is regarded as one of the star systems in the class of TADF emitters. In typical fluorescent materials, only singlet excitons (25 % of all excitons formed under electrical excitation) can emit light, while triplet excitons (75 %) are lost as non‑radiative heat. 
In TADF materials, the small ΔEₛₜ allows triplet excitons to up‑convert into singlet excitons via reverse intersystem crossing (RISC). Because this process can be thermally activated at room temperature, theoretically 100 % of the excitons can be harvested for light emission.
Specifically, the compound exhibits multiresonance TADF (MR‑TADF) behaviour. The boron‑ and nitrogen‑doping pattern produces narrow emission spectra (high colour purity) and very fast RISC rates, making it ideal for high‑efficiency organic LEDs.
--Blue to green emitter
Due to its electronic structure, the compound emits in the cyan to green region of the visible spectrum, with high external quantum efficiency (EQE) and excellent colour saturation. 
Spectral fine‑tuning can be achieved by varying the substituents (changing the number/position of tert‑butyl groups or modifying the donor/acceptor strength).
--Bipolar host material
Besides being an emitter on its own, the compound can also serve as a bipolar host matrix for blue phosphorescent emitters or other TADF dopants. 
Its balanced electron and hole mobilities help confine excitons within the emitting layer, while the high triplet energy (a consequence of the rigid B‑doped framework) prevents back‑energy transfer from the guest emitter to the host
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