Gravure printed flexible small-molecule organic light emitting diodes
Gravure printed flexible small-molecule organic light emitting diodes
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DOI：
10.1016/j.orgel.2013.09.027
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发表时间：
2013-12
影响因子：
3.2
通讯作者：
S. Tekoglu;G. Hernández-Sosa;E. Kluge;U. Lemmer;Norman Mechau
中科院分区：
文献类型：
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作者：
S. Tekoglu;G. Hernández-Sosa;E. Kluge;U. Lemmer;Norman Mechau
采用凹版印刷法制备了小分子柔性有机电致发光器件。为了改变功能油墨的流变性能，将绿色发光体嵌入到高分子量聚苯乙烯（PS-PS）基质中。油墨的粘度被表征为小分子：HPLC-PS重量比和溶剂类型的函数。凹版印刷的SMOLED显示出850 cd m-2的最大亮度，高达7.7 cd A-1的最大效率，以及3.5 V的开启电压。凹版印刷的SM：M-PS器件与旋涂的原始SM器件相比，显示出高出约67%的发光效率。
Small-molecule based flexible organic light-emitting diodes (SMOLEDs) were fabricated by gravure printing. In order to modify rheological properties of the functional ink, the green emitter was embedded into an ultrahigh molecular weight polystyrene (UHMW-PS) matrix. The viscosity of the ink was characterized as a function of the small molecule:UHMW-PS weight ratio and solvent type. The gravure printed SMOLEDs exhibited a maximum luminance of 850 cd m−2, a maximum efficiency of up to 7.7 cd A−1, and turn on voltage of ∼3.5 V. The gravure printed SM:UHMW-PS device exhibits ∼67% higher luminance efficiency comparing to the spin-coated pristine SM device.