t-DABNA is a DABNA derivative having four bulky tert-butyl side groups. Multiresonance MR-TADF emitter t-DABNA shows a high EQE of 25% and maintains the high efficiency even at high doping concentrations, owing to the intermolecular interaction being suppressed by the bulky tert-butyl group. t-DABNA has a suitable emission spectrum for application as pure blue OLEDs, showing a narrow FWHM of less than 50 nm, a high PLQY of around 90% and a CIEy of 0.07.

t-DABNA emitter, together with 9,10-bis(1-naphtyl)anthracene (α-ADN) host to harvest only singlet excitons, showed high external quantum efficiency of 7.6% as fluorescent emitters and lifetime longer than that of a conventional pyrene derived blue emitter.

Boron-based multiresonance MR-TADF emitters show great application potential in great color purity with narrowband emission and superior photoluminescence quantum yield (PLQY) coupled with the small singlet–triplet energy splitting.

A planar structure, v-DABNA, is also available in sublimed grade purity.

General Information

---

CAS number	1802003-07-1
Chemical formula	C46H53BN2
Molecular weight	644.74 g/mol
Absorption*	λmax 445 nm
Fluorescence	λem 462 nm (film)
HOMO/LUMO	HOMO = - 5.72eV, LUMO = - 3.02 eV (ES = - 2.80 eV, ET = - 2.63 eV)
Synonyms	2,12-di-tert-butyl-5,9-bis(4-(tert-butyl)phenyl)-5,9-dihydro-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracene, tDABNA
Classification / Family	Triarylamine derivatives, Blue dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials.

Product Details

---

Purity	Sublimed* >99.5% (HPLC), Unsublimed >99% (HPLC)
Melting point	TGA: Td = 418.7 °C (5% weight loss)
Appearance	Yellow powder/crystals

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.

Chemical Structure

---

2,12-di-tert-butyl-5,9-bis(4-(tert-butyl)phenyl)-5,9-dihydro-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracene (t-DABNA) chemical structure, 1802003-07-1