Pyrene-capped starburst emitters as gain media for organic lasers: Design, synthesis, and stabilized lasing properties

Article abstract of DOI:10.1039/c6tc01606e

A set of pyrene-capped starburst organic emitters composed of a non-planar cross-shaped spirofluorene core (SF-PyF) and a large rigid planar pyrene core (Py-PyF) have been designed, synthesized and explored as efficient emitters for organic lasers. High photoluminescence yields and excellent thermal stability of SF-PyF and Py-PyF in neat films make them promising optical gain media. Low amplified spontaneous emission (ASE) thresholds of 6.6 μJ cm^-2 (1.3 kW cm^-2) at 451 nm for SF-PyF and 5.4 μJ cm^-2 (1.1 kW cm^-2) at 490 nm for Py-PyF were obtained (pump pulse: λ_p = 355 nm, 10 Hz, 5 ns). Distributed feedback (DFB) lasers based on SF-PyF and Py-PyF exhibited good performance with low thresholds (16 nJ per pulse for SF-PyF and 24 nJ per pulse for Py-PyF, respectively) and the full width at half maximum of about 0.2 nm. Surprisingly, DFB lasers integrated with SF-PyF and Py-PyF as gain media exhibited excellent ambient photostability and superior reliability even in hot water (80 °C). The excellent stability of ASE spectra, electroluminescence spectra and lasing spectra under harsh conditions manifests that the resulting pyrene-capped starburst emitters are beneficial for improving the lasing stability issues. The study sheds light on exploring robust organic gain media toward electrically pumped OSLs.

Full text of DOI:10.1039/c6tc01606e

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Xu, C. Liu, W. Lai and W. Huang, J. Mater. Chem. C, 2016, DOI: 10.1039/C6TC01606E.
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Journal of Materials Chemistry C
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DOI: 10.1039/C6TC01606E
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WX bꢀuꢁXU îìíïU ììU írï n í
toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•

toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 2 of 9
View Article Online
DOI: 10.1039/C6TC01606E
!wÇL/[9
W}µŒvꢀo bꢀuꢁ
Br
Br
O
B
C6H13
Pd(dppf)2Cl2
C6H13
O
B
C6H13
C6H13
Pd (dppf)2Cl2
Pd(PPh3)4
K2CO3
O
Br
O
dioxane, KOAC
dioxane, KOAC
1
4
3
C6H13
C6H13
Br
K2CO3, TBAB
Br
Br
1,6-dibromohexane
2
C6H13
C6H
13 C6H13
C6H13
Br
Br
Br
Br
C6H13
C6H13
C6H13
C6H13
SF-PyF
4
Pd(PPh3)4
K2CO3
SF
Br
Br
Br2
C6H13
C6H13
HBr
Br
C6H13
C6H13
Br
5
C6H13
C6H13
C6H13
C6H13
Py-PyF
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toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 3 of 9
View Article Online
DOI: 10.1039/C6TC01606E
W}µŒvꢀo bꢀuꢁ
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toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 4 of 9
View Article Online
DOI: 10.1039/C6TC01606E
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toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•

toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 5 of 9
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DOI: 10.1039/C6TC01606E
W}µŒvꢀo bꢀuꢁ
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WX bꢀuꢁXU îìíïU ììU írï n ñ
toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•

Journal of Materials Chemistry C
Page 6 of 9
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DOI: 10.1039/C6TC01606E

toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 7 of 9
View Article Online
DOI: 10.1039/C6TC01606E
W}µŒvꢀo bꢀuꢁ
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50
40
30
20
10
0
SF-PyF
Py-PyF
0
10 20 30 40 50 60 70 80
Time (min)
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(b)
SF-PyF
468 nm
0.77 kW/cm2
0.0
0.5
1.0
1.5
2.0
2.5
3.0
30
20
10
0
Py-PyF
481 nm
1.2 kW/cm2
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Pump Intensity (kW/cm2)
1.25
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1
2
3
4
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425
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Wavelength (nm)
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WX bꢀuꢁXU îìíïU ììU írï n ó
toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•

toꢁꢀ•ꢁ ꢃ} v}š ꢀꢃiµ•š uꢀŒP]v•
Journal of Materials Chemistry C
Page 8 of 9
View Article Online
DOI: 10.1039/C6TC01606E
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Page 9 of 9
Journal of Materials Chemistry C
View Article Online
DOI: 10.1039/C6TC01606E
Graphic Abstract
A novel set of pyrene-capped starburst orgainc emitters have
been designed, synthesized and explored as efficient emitters
for organic lasers.