DMQA

Order Code: M971
MSDS sheet

Price

(excluding Taxes)

£99.00


General Information

CAS number 19205-19-7
Chemical formula C22H16N2O2
Molecular weight 340.37 g/mol
Absorption λmax 294 nm, 510 nm (in THF)
Fluorescence λem 523 nm (in THF)
HOMO/LUMO HOMO = 5.35 eV; LUMU = 3.17 eV [1]
Synonyms
  • N,N'-Dimethylquinacridone
  • 5,12-Dihydro-5,12-dimethylquino[2,3-b]acridine-7,14-dione
Classification / Family Green dopant materials, OLEDs, Photodetectors, Organic electronics

 

Product Details

Purity >99% (sublimed)
Melting point 286 °C (dec.)(lit.)
Colour Red powder/crystals

*Sublimation is a technique used to obtain ultra pure-grade chemicals. For more details about sublimation, please refer to the Sublimed Materials for OLED devices page.

 

Chemical Structure

DMQA structure
Chemical structure of N,N'-Dimethylquinacridone (DMQA); CAS# 19205-19-7; Chemical Formula C22H16N2O2.

 

Applications

N,N'-Dimethylquinacridone (DMQA) is a green dopant material used in OLEDs. Highly stable and longer-lifetime OLED devices have been achieved by using DMQA as the dopant to a double host (aminoanthracene and Alq3). It is believed that DMQA can prevent excimer formation, thus prolonging the the lifetime of the devices.

By using DMQA as a green dopant, very high efficiency OLEDs with a luminance of greater than 88,000 cd/m2,  EQE of 5.4% and current efficiency of 21.1 cd/A have been achieved. DMQA has also been used in green light photodetectors for practical applications, such as photo sensors and chemical sensors.

 

Device structure                                            ITO/CuPc (15 nm)/NPB (60 nm)/Alq3:0.4 wt.% DMQA (37.5 nm)/Alq (37.5 nm)/MgAg (200 nm) [2]
Colour Green green
Luminance 1,322 cd/m2
Current Efficiency 6.61 cd/A
Lifetime (T1/2) 7,500 hours
Device structure                                            ITO (150 nm)/a-NPB (60 nm)/Alq3: 1 wt.% C545T*:0.75 wt.% DMQA (30 nm)/Alq(30 nm)/LiF (0.8 nm)/Al (150 nm) [3]
Colour Green green
Max. EQE 6.7%
Max. Luminance 84,900 cd/m2
Max. Current Efficiency 23.4 cd/A

Device structure                                            (ITO)/2-TNATA (5 nm)/NPB (40 nm)/CBP:6 wt.% Ir(ppy)3:0.5 wt.% DMQA (30 nm)/Bphen (10 nm)/Alq3 (20nm)/LiF (0.5 nm)/Al (100 nm) [4]
Colour Green green
Max. EQE 1.85
Max. Current Efficiency 7.08 cd/A
Max. Power Efficiency 4.03 lm/W
Device structure                                            ITO (80 nm)/NPB (40 nm)/ADN:0.6 wt.% C545T*:1.2 wt.% DMQA (30 nm)//Alq3 (30 nm)/LiF (1 nm)/Al(100 nm) [5]
Colour Green green
Luminance @ 50 mA/cm2 4,750 cd/m2
Current Efficiency @ 50 mA/cm2 9.5 cd/A
Device structure                                            ITO/NPB (60nm)/ADN:Alq (9:1):0.8 wt.% DMQA (20nm)/BPhen (10nm)/Alq3 (30nm)/LiF (1nm)/Al (200nm) [6] [@20 mA/cm2: 14.7 cd/A) 
Colour Green green
Current Efficiency @ 20 mA/cm2 14.7 cd/A

*For chemical structure information please refer to the cited references

 

Characterisation

tga trace of DMQA

Thermal gravimetric analysis trace of N,N'-Dimethylquinacridone (DMQA).

 

Literature and Reviews

  1. Low dark current small molecule organic photodetectors with selective response to green light, D-S. Leem et al., Appl. Phys. Lett., 103, 043305 (2013); doi: 10.1063/1.4816502 .
  2. Doped organic electroluminescent devices with improved stability, J. Shi et al., Appl. Phys. Lett., 70, 1665 (1997); doi: 10.1063/1.118664.
  3. Highly efficient tris(8-hydroxyquinoline) aluminum-based organic light-emitting diodes utilized by balanced energy transfer with cosensitizing fluorescent dyes, Y. Park et al., Appl. Phys. Lett., 95, 143305 (2009); doi: 10.1063/1.3243689.
  4. Triplet to singlet transition induced low efficiency roll-off in green phosphorescent organic light-emitting diodes, Z. Su et al., Thin Solid Films 519, 2540–2543 (2011); doi:10.1016/j.tsf.2010.12.008.
  5. Green organic light-emitting diodes with improved stability and efficiency utilizing a wide band gap material as the host, H. Tang et al., Displays 29, 502–505 (2009); doi:10.1016/j.displa.2008.05.001.
  6. Improved efficiency for green and red emitting electroluminescent devices using the same cohost composed of 9,10-di(2-naphthyl)anthracene and tris-(8-hydroxyquinolinato)aluminum, J. Zhu et al., Physica E 42, 158–161 (2009); doi:10.1016/j.physe.2009.09.020.