Design Strategy for Robust Organic Semiconductor Laser Dyes,ACS Materials Letters

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Design Strategy for Robust Organic Semiconductor Laser Dyes
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsmaterialslett.9b00536
Yuya Oyama _{1,

2} , Masashi Mamada _{1,

2,

3} , Atul Shukla _{4,

5} , Evan G. Moore _{4,

6} , Shih-Chun Lo _{4,

6} , Ebinazar B. Namdas _{4,

5} , Chihaya Adachi _{1,

2,

3,

7}

Affiliation

A new molecular design for organic semiconductor laser dyes showing excellent optical properties and high robustness is disclosed in this work. The suitability of a furan moiety for increasing the thermal and photostability in newly developed furan-based derivatives (BPBFCz) is demonstrated by comparing a well-known laser molecule (BSBCz) having a bis-stilbene unit. The new derivatives exhibited high photoluminescence quantum yields of nearly 100% and radiative rate constants of ∼10⁹ s^–1 in both solution and doped films, and their properties were also excellent in neat films. The amplified spontaneous emission (ASE) thresholds of the BPBFCz materials were found to be very low (<1 μJ cm^–2), and the excited-state absorption in the ASE oscillation region was negligible, which is preferable for laser applications. In addition to these excellent optical properties, which are comparable or superior to those of BSBCz, the decomposition temperatures of the BPBFCz emitters were much higher than that of BSBCz, resulting in the suppression of impurity formation during the thermal deposition. In addition, the photostability of the new materials was dramatically improved compared with that of BSBCz. This study serves as a very significant advancement toward the practical application of organic semiconductor laser diodes and provides molecular design guidelines for robust organic laser molecules.

中文翻译：

耐用的有机半导体激光染料的设计策略

在这项工作中公开了一种有机半导体激光染料的新分子设计，该分子设计显示了出色的光学性能和高耐用性。通过比较具有双二苯乙烯单元的众所周知的激光分子（BSBCz），证明了呋喃部分在新开发的基于呋喃的衍生物（BPBFCz）中提高热稳定性和光稳定性的适用性。这些新衍生物在溶液和掺杂薄膜中均显示出近100％的高光致发光量子产率和约^{10 9} s ^–1的辐射速率常数，并且在纯净薄膜中的性能也很优异。发现BPBFCz材料的放大的自发发射（ASE）阈值非常低（<1μJcm ^–2），并且ASE振荡区域中的激发态吸收可以忽略不计，这对于激光应用是优选的。除了具有与BSBCz相当或优于BSBCz的优异光学特性外，BPBFCz发射极的分解温度也比BSBCz高得多，从而抑制了热沉积过程中杂质的形成。此外，与BSBCz相比，新材料的光稳定性大大提高。这项研究为有机半导体激光二极管的实际应用提供了非常重要的进展，并为坚固的有机激光分子提供了分子设计指南。

更新日期：2020-01-14

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