Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis‐stilbene,Advanced Functional Materials

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Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis‐stilbene
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-06-20 , DOI: 10.1002/adfm.201802130
Masashi Mamada _{1,

2} , Toshiya Fukunaga _{1,

2} , Fatima Bencheikh _{1,

2} , Atula S. D. Sandanayaka _{1,

2} , Chihaya Adachi _{1,

2,

3}

Affiliation

Advanced organic laser dyes exhibiting high solubility and bipolar behavior are developed based on a structure combining bis‐stilbene with carbazole (BSBCz). The materials show high photoluminescence quantum yields and large radiative rate constants in solutions, crystals, and blend and neat films. The introduction of alkyl groups significantly improves the solubility of BSBCz, and solution‐processed films of the alkyl‐substituted derivatives exhibit amplified spontaneous emission thresholds as low as 0.59 µJ cm⁻², which is comparable to those of vacuum‐deposited BSBCz films. On the other hand, cyano‐substitution on BSBCz (BSBCz‐CN) increases electron‐accepting properties, resulting in a bathochromic shift of the emission wavelength and improved bipolar behavior. In a BSBCz‐CN‐doped film, a low ASE threshold of 0.63 µJ cm⁻² is achieved, which is one of the lowest values for organic laser dyes with green emission. In addition, organic light‐emitting diodes based on BSBCz‐CN neat films exhibit external quantum efficiencies of 1.8% and could withstand injection of high current densities of up to 500 A cm⁻² under pulse operation. These properties along with low excited‐state absorption cross sections make these materials an outstanding addition to the existing library of organic laser dyes, especially for consideration in electrically pumped lasers.

中文翻译：

基于双苯乙烯的有机染料低自发发射阈值

基于双苯乙烯与咔唑（BSBCz）结合的结构，开发了具有高溶解度和双极性行为的高级有机激光染料。该材料在溶液，晶体，共混和纯净薄膜中显示出高的光致发光量子产率和大的辐射速率常数。烷基的引入显着提高了BSBCz的溶解度，烷基取代的衍生物的固溶膜表现出的自发发射阈值低至0.59 µJ cm ^-2，可与真空沉积的BSBCz膜相媲美。另一方面，BSBCz（BSBCz-CN）上的氰基取代增加了电子接受性能，导致了发射波长的红移并改善了双极性行为。在BSBCz-CN掺杂的薄膜中，可以实现0.63 µJ cm ^-2的低ASE阈值，这是具有绿色发射的有机激光染料的最低值之一。此外，基于BSBCz-CN纯薄膜的有机发光二极管的外部量子效率为1.8％，可以承受高达500 A cm ^-2的高电流密度注入在脉冲操作下。这些特性以及低的激发态吸收截面使这些材料成为现有有机激光染料库的出色添加，尤其是在电泵浦激光器中考虑的情况。

更新日期：2018-06-20

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