Table 1 Photophysical data of the studied di-N-aryl-substituted imidazo[4,5-b]pyrazin-2-ylidene based Ir(III) complexes at RT

From: Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off

 

abs λmaxa (nm)

em λmax (nm)

FWHMb (nm)

Φ (%)c

τobsc,d (ns)

τradc,e (ns)

kr (106 s‒1)e

knr (105 s‒1)e

f-ct1a

354 (2.52), 390 (2.25)

468

62

80

722

902

1.1

2.8

f-ct1b

348 (2.71), 390 (2.30)

468

63

75

681

908

1.1

3.7

f-ct1c

344 (2.81), 390 (2.31)

464

58

83

528

636

1.6

3.2

f-ct1d

339 (2.91), 391 (2.32)

462

56

89

2290

2573

0.39

0.48

  1. aThose were recorded at a conc. of 10−5 M in toluene at RT; extinction coefficient (ε) is given in parentheses with a unit of 104 M−1 cm−1.
  2. bFull width at half maximum.
  3. cCoumarin 102 (C102) in methanol (Q.Y. = 87% and λmax = 480 nm) was employed as standard, and data recorded in degassed toluene solution in 10‒5 M at RT.
  4. dObserved lifetimes were obtained from transient PL measurement.
  5. eτrad = τobs/PLQY, kr = PLQY/τobs and knr = (1‒PLQY)/τobs.
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