Ladder-type Indenefluorenylene-based Conjugated Polymers with RGB Emission as Efficient Gain Media for Organic Lasers: Design, Synthesis, and Optical Gain Properties

Ting-ting Lu; Si-ju Chang; Yuan-yuan Liu; Jin-qiang Pan; Wen-yong Lai; Wei Huang

doi:10.11777/j.issn1000-3304.2018.17261

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Ladder-type Indenefluorenylene-based Conjugated Polymers with RGB Emission as Efficient Gain Media for Organic Lasers: Design, Synthesis, and Optical Gain Properties

Research Article | 更新时间：2021-01-26

- Ladder-type Indenefluorenylene-based Conjugated Polymers with RGB Emission as Efficient Gain Media for Organic Lasers: Design, Synthesis, and Optical Gain Properties
  增强出版
- Acta Polymerica Sinica Issue 2, Pages: 304-314(2018)
- 作者机构：
  
  有机电子与信息显示国家重点实验室培育基地南京邮电大学信息材料与纳米技术研究院南京 210023
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.17261
  CLC：
- Published：20 February 2018，
  
  Received：11 September 2017，
  
  Revised：7 October 2017，
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Ting-ting Lu, Si-ju Chang, Yuan-yuan Liu, Jin-qiang Pan, Wen-yong Lai, Wei Huang. Ladder-type Indenefluorenylene-based Conjugated Polymers with RGB Emission as Efficient Gain Media for Organic Lasers: Design, Synthesis, and Optical Gain Properties. [J]. Acta Polymerica Sinica (2):304-314(2018)
DOI：

Ting-ting Lu, Si-ju Chang, Yuan-yuan Liu, Jin-qiang Pan, Wen-yong Lai, Wei Huang. Ladder-type Indenefluorenylene-based Conjugated Polymers with RGB Emission as Efficient Gain Media for Organic Lasers: Design, Synthesis, and Optical Gain Properties. [J]. Acta Polymerica Sinica (2):304-314(2018) DOI： 10.11777/j.issn1000-3304.2018.17261.

摘要

采用Suzuki聚合方法合成了一类梯形茚并芴基共轭聚合物，其中梯形茚并芴单元分别与蒽（An）、苯并噻二唑（BT）以及双噻吩基苯并噻二唑（TBT）进行交替共聚，得到了蓝（2LF-An）、绿（2LF-BT）、红（2LF-TBT）三色发光的共轭聚合物材料，薄膜状态下，发射波长分别为448、545、632 nm，发射光谱覆盖可见光波段.制备的有机电致发光器件获得了三基色电致发光：2LF-An、2LF-BT、2LF-TBT器件的电流效率分别为1.10、3.11、0.50 cd/A，最大亮度分别为2772、8582、1682 cd/m

.自发放大辐射（ASE）测试结果显示，2LF-An和2LF-BT获得了较低ASE泵浦阈值（

），分别为20.90和65.84 μJ/cm

，增益分别为62.40和66.07 cm

-1

，而常见的聚（9，9-二辛基芴-苯并噻二唑）衍生物（F8BT）在相同测试条件下的增益仅为26.88 cm

-1

.2LF-TBT红光聚合物材料通过掺杂后观察到ASE行为，当掺杂比例为1%时，

为88.04 μJ/cm

，增益

为68 cm

-1

.更重要的是，ASE稳定性测试结果表明，所得红绿蓝三色聚合物材料均表现出优异的ASE发光稳定性，即使在200 ℃退火处理的条件下仍能维持ASE泵浦阈值不发生明显变化.优异的光稳定性和高增益特性使得该类梯形茚并芴基共轭聚合物展现出作为激光增益介质的应用潜力.

Abstract

A set of novel ladder-type conjugated copolymers (2LF-An

2LF-BT and 2LF-TBT) were designed

synthesized

and investigated as efficient gain media for organic lasers. The polymers were synthesized

via

Suzuki polymerization of indenefluorene units with varying blue

green

and red emitting units to afford RGB conjugated polymers with the emission wavelength ranging from 448 nm to 632 nm

covering the full visible spectrum. The thermal

morphological

photophysical

electrochemical

electroluminescent

and optical gain properties of the resulting conjugated polymers were systematically investigated and compared with those of the poly(9

9-dioctylfluorene-co-benzothiadiazole) (F8BT) counterpart. With the ladder-type backbone structures incorporated

the resulting indenofluorene-based conjugated polymers exhibited enhanced optical and electrical properties with low ASE thresholds and high net gain coefficients. Organic light-emitting diodes (OLEDs) based on 2LF-An

2LF-BT and 2LF-TBT were fabricated. The current efficiency of the 2LF-An

2LF-BT and 2LF-TBT devices was 1.10

3.11 and 0.50 cd/A

respectively

while the maximum brightness was 2772

8582

1682 cd/m

respectively. Low amplified spontaneous emission (ASE) thresholds were achieved for 2LF-An (20.90 μJ/cm

) and 2LF-BT (65.84 μJ/cm

) with high gain coefficients of 62.40 cm

-1

for 2LF-An and 66.07 cm

-1

for 2LF-BT

respectively. By blending 1% 2LF-TBT into 2LF-BT

high optical gain coefficients of

=68 cm

-1

were recorded for 2LF-TBT with the ASE peak at 600 nm and the ASE threshold of 68 cm

-1

. For comparison

the optical gain coefficient of F8BT was recorded at around 26.88 cm

-1

under identical test conditions. The results suggested that the incorporation of ladder-type indenofluorene chain structures played a positive role on improving the optical gain properties. More impressively

the low ASE thresholds were almost unchanged for the samples even upon annealing up to 200 ℃ for the polymers

indicating excellent optical stability. The excellent optical stability

low ASE thresholds

and high net gain coefficients of the resulting polymers have promised their great potential to be used as efficient gain media for organic lasing.

关键词

共轭聚合物有机半导体激光光增益介质自发放大辐射梯形茚并芴

Keywords

Conjugated polymersOrganic semiconductor lasersOptical gain mediaAmplified spontaneous emission (ASE)Indenofluorene

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School of Materials Science and Engineering, Tianjin University

Institute of Materials for Optoelectronics and New Energy, School of Materials Science and Engineering, Wuhan Institute of Technology

Institute of Polymer Optoelectronic Materials & Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology

School of Textile Materials and Engineering, Wuyi University

State Key Laboratory of Luminescent Materials and Devices, South China University of Technology

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