Table 1 Optical properties of FZ nanographene compounds dispersed in PS films (no resonator)

From: Solution-processed nanographene distributed feedback lasers

FZ compounda

PLQYb

[%]

λ ABS-max c

(nm)

λ PL-max d

(nm)

h e

(μm)

λ pump f

(nm)

α [λpump]g

(× 103 cm−1)

tp[λpump]h

(ns)

λ ASE i

(nm)

FWHMASEj

(nm)

E th ASE k

(μJ cm−2)

1 (1 wt%)

82

402, 426, 452

456, 485, 519

0.40

452

4.40

3.9

485.8

4

45

0.40

426

1.95

3.8

485.8

4

60

2 (1 wt%)

73

474, 509, 545

547, 588

0.48

545

4.40

4.4

590.5

4

30

0.48

509

1.55

4.2

590.5

4

70

2 (3 wt%)

31

474, 509, 545

548, 589

0.50

545

14.3

4.4

591.7

5

200

3 (1 wt%)

–

613, 668

676, 740

0.60

668

3.30

4.6

685.1

3

∼2 × 104

   

0.60

613

0.56

4.5

685.1

3

∼3 × 104

  1. aNumber of nanographene compound, among 1, 2 and 3; doping rate (error ~0.1 wt%) in PS indicated in brackets
  2. bPhotoluminescence quantum yield (error ∼10%)
  3. cPeak absorption wavelengths (maximum absorption peak is underlined)
  4. dPeak photoluminescence wavelengths (maximum photoluminescence peak is underlined)
  5. eFilm thickness (error ∼2%)
  6. fPump wavelength
  7. gAbsorption coefficient at λpump (error ∼2%)
  8. hPump pulse width at λpump
  9. iAmplified spontaneous emission (ASE) wavelength (error is ± 0.5 nm)
  10. jASE linewidth (error is ± 1 nm), defined as the full width at half maximum, FWHM, well above the threshold
  11. kASE threshold (error ∼20%), determined from plots such as those of Supplementary Fig. 2, as the incident pump energy density at which the FWHM decays to half of its maximum value
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