Table 1 Molecular weight data (weight-average molecular weight, Mw number-average molecular weight, Mn and dispersity (Ɖ) of PPV copolymers P1–P6 and MEH-PPV reference material and upconversion performance parameters of samples containing these polymer emitters.

From: Revealing the influence of steric bulk on the triplet–triplet annihilation upconversion performance of conjugated polymers

Polymer

n:m

Mw (g/mol)

Mn (g/mol)

Ɖ

Degree of polymer-isationa

Average # of chromophoresb

ΦPL (%)c

ΦUC (%)d

ΦTET (%)e

ΦTTA (%)f

P1

1:0

450,000

95,100

4.7

95

8

58 ± 3

0.0087

1.0

1.50

P2

10:1

483,000

70,800

3.6

76

7

50 ± 7

0.011

10

0.22

P3

5:1

452,000

193,000

2.5

220

20

51 ± 3

0.020

19

0.21

P4

1:1

144,000

39,000

3.7

62

6

43 ± 1

0.081

51

0.37

P5

1:5

142,000

31,600

4.5

82

7

36 ± 5

0.150

57

0.73

P6

1:10

163,000

59,100

2.8

181

16

37 ± 4

0.160

63

0.69

MEH-PPV

–

62,500

20,100

3.1

77

7

30 ± 3

0.052

87

0.20

  1. aDegree of polymerisation determined from the ratio of Mn and the average monomer molecular weight based on the initial stoichiometry used in the polymerisation.
  2. bCalculated based on the degree of polymerisation and assuming 11 repeat units per chromophore28.
  3. cΦPL of P1–P6 (0.25 mg/ml) and MEH-PPV (0.5 mg/ml) measured in chloroform with excitation at 440 nm (see Supplementary Information for experimental details), error given as 2σ (N = 3).
  4. dΦUC of P1–P6 (0.25 mg/ml) and MEH-PPV (0.5 mg/l with PdTPTBP (7.5 μM) as the sensitizer in chloroform solution using 632 nm wavelength and 10,468 mW/cm2 power excitation.
  5. eΦTET was obtained using the integrated phosphorescence intensity of the copolymer samples compared with that of the sensitizer-only sample (see Supplementary Information for Experimental Details).
  6. fΦTTA was calculated using Eq. (1).
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