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Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis-stilbene

机译：基于双苯乙烯的有机染料低自发发射阈值

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摘要

1802130.1-1802130.9%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 mu J 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 mu J 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.
机译：1802130.1-1802130.9％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，并且烷基取代的衍生物的固溶膜表现出的自发发射阈值低至0.59μJcm（-2），与真空沉积的BSBCz相当。电影。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，实现了0.63μJ·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整齐薄膜的有机发光二极管具有1.8％的外部量子效率，并且可以承受脉冲操作下高达500 A cm（-2）的高电流注入。这些特性以及低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，尤其是考虑到电泵浦激光器。

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