DABNA-1

CAS Number 1689552-89-3

Dopant Materials, High Purity Sublimed Materials, Materials, Semiconducting Molecules, TADF Materials

Blue Dopant Material with Boron-based triarylamines

High purity sublimed narrowband multi-resonance thermally activated delayed fluorescent (MR-TADF) emitter for highly efficient OLEDs

DABNA-1, namely 5,9-diphenyl-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracene, has a rigid polycyclic aromatic framework containing a triphenyl boron core and two nitrogen atoms that are connecting all five phenyl rings. Structurally, DABNA-1 also can be considered as two triphenyl amines that has one common phenyl ring which is joined by two other neighbouring phenyl rings with a boron to form a triphenyl boron central core. DABNA-1 was one of the first developed multi-resonance thermally activated delayed fluorescence (MR-TADF) materials containing one boron atom and two nitrogen atom with boron and nitrogen exhibiting the opposite resonance effect.

DABNA-1 exhibited deep blue emission with photoluminescence quantum efficiency (PLQY) and singlet–triplet energy splitting (ΔE_ST) of 0.88 and 0.18 eV in 1 wt.% doped mCBP film. Deep blue OLED devices based on DABNA-1 showed high efficiency with an EQE value of 13.5% and a colour coordinate of (0.13, 0.09), along with high colour purity of very narrow EL spectra full width at half maximum (FWHM) of 28 nm at 459 nm. Though showing high efficiency roll-off, DABNA-1 and its derivatives are promising candidates for developing high colour purity, high efficiency deep blue TADF-OLEDs.

General Information

CAS number	1689552-89-3
Chemical formula	C₃₀H₂₁BN₂
Molecular weight	420.31 g/mol
Absorption*	λ_max 437 nm (in DCM)
Fluorescence	λ_em 462 nm (film)
HOMO/LUMO	HOMO = 5.58 eV, LUMO = 2.91 eV (ΔE_ST = 0.18 eV)
Synonyms	5,9-Diphenyl-5,9-diaza-13b-boranaphtho[3,2,1-de]anthracene
Classification / Family	Triarylamine derivatives, Blue dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials.

Product Details

Purity	Sublimed* >99% (HPLC)
Melting point	n.a.
Appearance	Bright yellow powder

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

Chemical Structure

Device Structure(s)

Device structure	ITO (50 nm)/NPD (40 nm)/TCTA (15 nm)/mCP (15 nm): 1 wt% DABNA-1/mCBP (20 nm)/TSPO1* (40 nm)/LiF (1 nm)/Al (100 nm) [1]
Colour	Deep blue (0.13, 0.09), emission at 459 nm with an FWHM of 28 nm
Max Current Efficiency	10.6 cd/A
Max EQE	13.15%

*For chemical structure information, please refer to the cited references.

MSDS Documentation

DABNA-1 MSDS Sheet

Literature and Reviews

Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO–LUMO Separation by the Multiple Resonance Effect, T. Hatakeyama et al., Adv. Mater., 28 (14); 2777-2781 (2016); DOI: 10.1002/adma.201505491.
Ternary Exciplexes for High Efficiency Organic Light-Emitting Diodes by Self-Energy Transfer, S. Jeon et al., Adv. Opt. Mater., 7 (5), 1801462 (2019); DOI: 10.1002/adom.201801462.
Triptycene-Fused Sterically Shielded Multi-Resonance TADF Emitter Enables High-Efficiency Deep Blue OLEDs with Reduced Dexter Energy Transfer, H. Mubarok et al., 135 (32), e202306879 (2023); DOI: 10.1002/ange.202306879.

Manipulating Spectral Width and Emission Wavelength towards Highly Efficient Blue Asymmetric Carbazole Fused Multi-Resonance Emitters, H. Lee et al., ACS Appl. Mater. Interfaces, 14 (32), 36927–36935 (2022); DOI: 10.1021/acsami.2c10127.
Narrowband Deep-Blue Multi-Resonance Induced Thermally Activated Delayed Fluorescence: Insights from the Theoretical Molecular Design, Y. Wu et al., Molecules, 27, 348 (2022); DOI: 10.3390/molecules27020348.
Recent Advancement in Boron-Based Efficient and Pure Blue Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes, H. Lee et al., Front. Chem., 8, 373 (2020); DOI: 10.3389/fchem.2020.00373.