Printable biflourene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance
Printable biflourene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance
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DOI：
10.1016/j.orgel.2022.106513
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发表时间：
2022-04
影响因子：
3.2
通讯作者：
Sasikumar Arumugam;Yi Li;James E. Pearce;Katie L. Court;Giacomo M. Piana;E. Jackman;Oliver J. Ward;M. Charlton;J. Tudor;D. Harrowven;S. Beeby
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文献类型：
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作者：
Sasikumar Arumugam;Yi Li;James E. Pearce;Katie L. Court;Giacomo M. Piana;E. Jackman;Oliver J. Ward;M. Charlton;J. Tudor;D. Harrowven;S. Beeby
已经制备了一系列可印刷的UV发射离子联芴衍生物，其并入侧链烷基咪唑鎓基团。在此，我们详细介绍了化合物的合成和器件制造中使用的方法。我们展示了如何通过延长烷基链长度和将抗衡离子从PF 6 −切换到CF 3SO 3 −来提高活性联芴的溶解度，从而改善油墨配方。我们还展示了如何通过喷涂来制造有机发光电化学电池（OLECs），以实现厚度为150-200 nm的活性层，从而使工作器件的开启电压约为6.5 V。这给出了在385 nm和390 nm之间具有峰值的电致发光（EL），最大EL发射强度为1.29 μW/cm 2。因此，通过将合成的分子喷涂到载玻片上，已经成功地证明了UV范围内的EL发射。
A series of printable UV emitting ionic bifluorene derivatives have been prepared incorporating pendent alkylimidazolium groups. Herein, we detail the synthesis of compounds and the methods used in device fabrication. We show how ink formulation is improved by increasing the solubility of the active bifluorene through extension of the alkyl chain length and switching the counter ion from PF6−to CF3SO3−. We also show how organic light emitting electrochemical cells (OLECs) can be fabricated by spray coating to achieve an active layer with a thickness of ∼150–200 nm, leading to working devices with a turn on voltage of around 6.5 V. This gives electroluminescent (EL) that peaks between 385 nm and 390 nm with a maximum EL emission intensity of 1.29 μW/cm2. Thus, EL emission within the UV range has been demonstrated successfully with the synthesised molecules via spray coating onto glass slides.