DMQA

Order Code: M971
MSDS sheet

Price

(excluding Taxes)

£109.00


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

*Sublimation is a technique used to obtain ultra pure grade chemicals to get rid of mainly trace metals and inorganic impurities. Sublimation happens under certain pressure for chemicals to only go through two physical stages, from a solid sate to vapour (gas) and then the vapour condensed to a solid state on a cool surface (referred to as cold finger). The most typical examples of sublimation are iodine and dry ice. For more details about sublimation, please refer to sublimed materials for OLEDs and perovskites and our collection of sublimed materials.

 

Chemical Structure

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

 

Applications

N,N'-Dimethylquinacridone (DMQA) is 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.