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基于NPB的蓝色有机电致发光器件的制备和表征

期刊名称：发光学报, ,28(2),184-188, 2007.4
时间：0
分类：TN383.1[电子电信—物理电子学] TN873.3[电子电信—信息与通信工程]
作者机构：[1]电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室,四川成都610054
相关基金：国家杰出青年基金（60425101）;电子科技大学中青年学术带头人基金（060206）资助项目
相关项目：传感技术及其系统

关键词：有机发光二极管, NPB, BCP, 蓝色, organic light-emitting diodes , NPB , BCP , blue light

中文摘要：

在常规的双层绿色有机电致发光器件氧化铟锡（ITO）／N，N＇-bis-（1-naphthyl）-N，N＇-biphenyl-1，1’-biphenyl-4，4＇-diamine（NPB）／8-hydroxyquinoline aluminum（Alq3）／Mg：Ag的基础上，通过选择适当的空穴阻挡层材料，制备得到以NPB为发光层的蓝色发光器件，其结构为ITO／NPB／bathocuproine（BCP）／Alq3／Mg：Ag，其最大亮度和最大流明效率分别达到2900cd／m^2和0．55lm／W。电致发光谱峰位于445nm，CIE色坐标为（x=0．16，y=0．09），且二者都不随外加电压而变化；利用各功能层的能级结构，对不同结构的器件性能差异进行了分析。

英文摘要：

Organic light-emitting diode （OLED） has attracted considerable attention due to their unique image quality and market potentials in display field. Efficient blue, green and red emitters with excellent color purity are required for full-color display application, so far great improvements have been achieved for the life time and efficiency of the red and green materials. However, the blue emitting material is still a barrier to commercial applications of OLEDs. Using vacuum thermal evaporation method, blue OLEDs were fabricated by inserting a bathocuproine （BCP） as hole blocking layer （HBL） into conventional double layer （DL） device at the interface of N, N＇- bis-（ 1 -naphthyl） -N, N＇-biphenyl-1,1 ＇-biphenyl4,4＇-diamine （ NPB ）/8-hydroxyquinoline aluminum （ Alq3 ）. Device structure is indium tin oxide （ITO）/NPB/BCP/Alq/Mg： Ag, where NPB acts as both hole transporting layer （HTL） and emitting layer （EML）, and Alq3 as electron transport layer （ETL）. The active emissive area of each device defined by the overlap of ITO and Mg： Ag was 4 mm × 4 mm. Measurements of luminancevoltage （L-V） and current density-voltage （J-V） characteristics were carried out with a Keithley 4200 Semiconductor Characterization System, photoluminescence （PL） and electroluminescence （EL） spectra were measured with an OPT-2000 system. The luminance-voltage and current density-voltage characteristics of devices were investigated, and differences between their performances were discussed. The results demonstrate that the maximum luminance and luminance efficiency of the BCP device are 2 900 cd/m^2 and 0.55 lm/W, respectively. The peak of electrolu-minescence （EL） spectrum locates at 445 nm and the Commissions Internationale d＇Eclairage （CIE） coordinates are （x =0. 16, y =0.09）, which are independent on the variation of bias voltage. Energy level diagrams were employed to analyze the diversity of device performance with different structures. We find that the hi

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