Table 2 Transient PL characteristic and rate constants of films

From: Harmonization of rapid triplet up-conversion and singlet radiation enables efficient and stable white OLEDs

Film

λmaxa (nm)

τpb (ns)

τdb (μs)

ΦPLc (%)

Φpd (%)

Φdd (%)

kr,Se × 107 (s−1)

kISCe × 107 (s−1)

kRISCe × 104 (s−1)

kFETf × 106 (s−1)

kDETf × 105 (s−1)

20 wt% 5TCzBN:DMIC-TRZ

490

17.0

5.8

63

18

45

1.0

4.2

61

56.1

2.4

0.5 wt% MR-Y:20 wt% 5TCzBN:DMIC-TRZ

490/

550

8.7/

3.5

1.6/

3.4, 110.0

95

-

-

-

-

-

0.5 wt% MR-Y:DMIC-TRZ

550

8.1

140.0

98

44

54

5.4

6.8

1.6

-

-

20 wt% mMDBA-DI:DBFPO

466

47.3

2.5

97

25

72

0.6

1.4

149

7.5

2.4

0.5 wt% MR-O:20 wt% mMDBA-DI:DBFPO

466/

580

34.9/4.6

1.1/

2.4, 109.0

93

-

-

-

-

-

0.5 wt% MR-O:DBFPO

580

7.1

117.0

97

51

46

7.2

6.6

1.6

-

-

  1. aPeak wavelength of the PL spectrum in the film;
  2. bLifetime of the prompt component and delayed component determined from the transient PL decay curve at 298 K;
  3. cAbsolute photoluminescence quantum yield measured with an integration-sphere system under argon atmosphere;
  4. dAbsolute photoluminescence quantum yield of prompt fluorescence and delayed fluorescence;
  5. eRate constants of singlet radiative decay, intersystem crossing and reverse intersystem crossing.
  6. fRate constants of Förster energy transfer and Dexter energy transfer.
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