3DPA-DiKTa

Dopant Materials, High Purity Sublimed Materials, Materials, MR-TADF Materials, OLED Materials, Red Dopant Materials, Semiconducting Molecules, TADF Materials

MSDS

MR-TADF Red Dopant with a DiKTa Core

High purity sublimed narrowband MR-TADF emitter for highly efficient OLEDs, 3,7,11-Tris(diphenylamino)quinolino[3,2,1-de]acridine-5,9-dione, Sublimed ≥99.0%

3DPA-DiKTa is a MR-TADF pure red emitter with three electron-donating diphenylamine (DPA) units symmetrically attached to an electron-accepting acridine-5,9-dione (DiKTa) core at the positions opposite to the central nitrogen atom, characterized by relatively small ΔE_ST of 0.20 eV, narrow FWHM of 56 nm, and high photoluminescence quantum efficiency of 60% in 2 wt.% mCP doped films with emission at 617 nm.

Due to the preferential horizontal orientation of the transition dipole moments of the emitter, OLED-TADF device based on 3DPA-DiKTa as the active layer material exhibits bright, narrowband red emission in doped films, showing great performance with maximum external quantum efficiencies (EQE_max) of 16.7% at λ_EL=613 nm. When 4CzIPN is used as an assistant dopant, hyperfluorescence (HF) device based on 3DPA-DiKTa shows significantly improved efficiency roll-off and higher brightness.

The MR-TADF green emitter 3TPA-DiKTa and blue emitter Mes3DiKTa are also available in sublimed grade.

General Information

CAS Number	n.a.
Chemical formula	C₅₆H₃₈N₄O₂
Molecular weight	798.93 g/mol
Absorption*	λ_max 554 nm (in toluene)
Fluorescence	λ_em 617 nm (in film)
HOMO/LUMO	HOMO = - 5.13 eV, LUMO = - 3.01 eV; ΔE_ST = 0.20 eV [1]
Synonyms	3,7,11-Tris(diphenylamino)quinolino[3,2,1-de]acridine-5,9-dione
Classification or Family	DiKTa derivatives, Diphenylamines, Red dopant, Multiresonance thermally activated delayed fluorescent (MR-TADF), Sublimed materials.

Product Details

Purity	Sublimed* >99% (HPLC)
Melting point	M_p = 287-289 °C [1]
Appearance	Deep red powder/crystals

* 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 (112 nm)/HATCN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/mCP (10 nm)/2.0 wt.% 3DPA-DiKTa:mCP (20 nm)/TmPyPB (50 nm)/LiF (0.6 nm)/Al (100 nm) [1]
Colour	Red light emission at 613 nm
FWHM	60 nm
Max Luminance	8,800 cd m^-2
CIE coordinates	(0.633, 0.365)
Max Current Efficiency	28 cd/A
Max Power Efficiency	27 lm/W
Max EQE	16.7%

Device structure	ITO/HATCN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/mCP (10 nm)/10 wt % 4CzIPN and 2 wt. % 3DPA-DiKTa in mCP (20 nm)/TmPyPB (50 nm)/LiF (0.6 nm)/Al (100 nm) [1]
Colour	Red light emission at 615 nm
FWHM	61 nm
Max Luminance	46,003 cd m^-2
CIE coordinates	(0.585, 0.396)
Max Current Efficiency	35 cd/A
Max Power Efficiency	37 lm/W
Max EQE	17.9%

MSDS Documentation

3DPA-DiKTa MSDS Sheet

Literature and Reviews

S. Wu et al. (2022); Highly Efficient Green and Red Narrowband Emissive Organic Light-Emitting Diodes Employing Multi-Resonant Thermally Activated Delayed Fluorescence Emitters, Angew. Chem. Int. Ed., 61 (52), e202213697; DOI: 10.1002/ange.202213697.
Z. Zhang et al. (2025); Design strategy for thermally activated delayed fluorescence materials with multiple resonance effect, Acta Phys-Chim Sin., 41 (1), 100006; DOI: 10.3866/PKU.WHXB202309042.