mMDBA-DI, namely 5-(3, 11-dimethyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-10,15-diphenyl-10,15-dihydro-5H-diindolo[3, 2-a:3′, 2′-c]carbazole, is a D-A type MR-TADF emitter that features a faster kRISC of 1.5 × 106 s−1. Among the developed TADF sensitizers, the mMDBA-DI demonstrates deep blue color with a high horizontal dipole orientation ratio of 0.82 and PLQY of 97.8%.  mMDBA-DI has large spectrum overlap with v-DABNA,  hyperfluorescence (HF) device with mMDBA-DI exhibits EQEmax of 39.9% with max electroluminescence of 474 nm and 19 nm of FWHM.

Also, Hyperfluorescence device based on TADF host material, mMDBA-DI, and a pure blue multi-resonance type tert-butyl substituted TADF fluorescence emitter t-Bu-ν-DABNA exhibits a high external quantum efficiency of 39.1% along with narrow emission with full width at half maximum of 19 nm (CIE y = 0.15). 

General Information

Product Details

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

Chemical Structure

5-(3,11-dimethyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-10,15-diphenyl-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazole  (mMDBA-DI) chemical structure, 2770257-85-5

Device Structure(s)

Device structure	ITO (50 nm)/HATCN (7 nm)/TAPC (50 nm)/DCDPA* (10 nm)/DBFPO:30% mMDBA-DI (25 nm)/DBFPO (5 nm)/TPBi (20 nm)/LiF (1.5 nm)/Al (100 nm) [1]
Colour	Blue light emission at 474 nm, (0.14, 0.23)
Max Current Efficiency	38.2 cd/A
FWHM	60 nm
Max EQE	31.8%

Device structure	ITO (50 nm)/HATCN (7 nm)/TAPC (50 nm)/DCDPA* (10 nm)/DBFPO:30% mMDBA-DI:5% t-Bu-ν-DABNA (25 nm)/DBFPO (5 nm)/TPBi (20 nm)/LiF (1.5 nm)/Al (100 nm)
Colour	Blue light emission at 474 nm, (0.12, 0.15)
Max Current Efficiency	30.3 cd/A
FWHM	19 nm
Max EQE	39.1%