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作 者:孟腾飞[1,2] 何志群[1] 刘姝[2] 刘淑洁[2] 梁春军[1] 张娇[1,2]
机构地区:[1]北京交通大学光电子技术研究所教育部发光与光信息技术重点实验室,北京100044 [2]国家电光源质量监督检验中心(北京),北京100022
出 处:《发光学报》2012年第10期1095-1100,共6页Chinese Journal of Luminescence
基 金:国家自然科学基金(21174016);国际科技合作计划(2008DFA61420);北京市科委(Z090803044009001);北京交通大学基金(2009JBZ019-1)资助项目
摘 要:制备并研究了基于3种小分子荧光材料的白光有机电致发光器件。发光层采用红色发光材料DCJTB掺杂绿光材料Alq3构成混合发光层,与OXD-7构成的蓝色发光层形成异质结的结构,并以NPB为空穴注入层。通过改变结构参数详细研究了发射光谱及其色坐标的电场依赖性。通过分析载流子注入/传输特性,控制激子的复合区域等措施得到了色坐标稳定性好、光谱丰富的高性能白光电致发光器件。经过优化的器件结构可以覆盖更大的可见光区域,当电压从9 V增加到13 V时,色坐标仅从CIE(x,y)=(0.364,0.314)偏移到CIE(x,y)=(0.332,0.291),具有较好的色稳定性。White organic light-emitting diodes based on three small molecular fluorescence materials were designed and prepared. The emitting layers consisted of a red dye, 4- (dicyanomethylene) -2- tert-butyl-6-(1,1,7,7-tctra-methyljulolidin-4-yl-vinyl) -4H-pyran ( DCJTB), doped in a green layer of 8-hydroxyquinoline aluminum salt (Alqz), which further formed a heterojunction with a blue layer of 2,2'- ( 1,3-phenylene ) -bis [ 5-(4-tert-butylphenyl) - 1,3,4-oxadiazole ] ( OXD-7 ). N, N'- bis-(naphthalene-l-yl) -N, N'-bis(phenyl)-benzidine (NPB) was used as a hole transport layer. Voltage dependent emission spectra and their colorimetric characteristics were manipulated using different device structures. After adjusting the carrier injection/transporting properties, the exciton recombination region was confined and the color stability was improved against the driving voltages. An improved white light-emitting device has a wide spectrum in visible range and a good color stabil-ity, its color coordinates change slightly from CIE(x,y) = (0. 364,0. 314) to CIE(x,y) = (0. 332, 0. 291 ) when the driven voltage changes from 9.1 V to 12.9 V.
关 键 词:白光电致发光 三波段 DCJTB∶Alq3掺杂 激子复合 色坐标稳定性
分 类 号:TN383.1[电子电信—物理电子学]
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