Table 1 Photophysical properties of ν-DABNA-M and ν-DABNA-M-B-Mes in poly(methyl methacrylate) (PMMA) (1 wt% doped films)

From: Late-stage direct double borylation of B/N-based multi-resonance framework enables high-performance ultra-narrowband deep-blue organic light-emitting diodes

Compound

λmax

[nm]

FWHM

[nm]

ΔEST(a)

[meV]

Φ(b)

[-]

ΦF(c)

[-]

ΦTADF(c)

[-]

τF(d)

[ns]

τTADF(d)

[μs]

kF(e)

[108 s–1]

kIC(e)

[107 s–1]

kISC(e)

[107 s–1]

kRISC(e)

[105 s–1]

ν-DABNA-M

473

17

117

0.92

0.755

0.165

4.60

10.0

1.64

1.43

3.89

1.22

ν-DABNA-M-B-Mes

463

16

109

0.93

0.659

0.272

2.60

6.90

2.57

1.90

11.4

2.05

  1. (a)Singlet–triplet energy gap estimated from the emission maxima of fluorescence and phosphorescence at 77 K; (b)Absolute photoluminescence quantum yield under N2; (c)Fluorescent and TADF components determined from the total Φ and contribution of the integrated area of each component in the transient spectra to the total integrated area; (d)Lifetimes calculated from fluorescence decay; (e)Rate constants of fluorescence (kF), internal conversion from S1 to S0 (kIC), intersystem crossing from S1 to T1 (kISC), and reverse intersystem crossing from T1 to S1 (kRISC) calculated from Φ, ΦF, ΦTADF, τF, and τTADF according to reported methods55,56.
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