超薄层在白色有机电致发光器件中的应用

以DCJTB为掺杂剂, 以BCP为空穴阻挡层, 研究了两种结构的有机电致发光器件ITO/NPB/BCP/Alq3:DCJTB/Alq3/Al(结构A)和ITO/NPB/BCP/Alq3/Alq3:DCJTB/Alq3/Al(结构B)的电致发光光谱. 实验结果显示, 在结构A器件的电致发光光谱中, 绿光的相对发光强度较弱,增加Alq3层的厚度对绿光的相对发光强度的影响也很小; 而在结构B器件的电致发光光谱中, BCP层与掺杂层(Alq3:DCJTB)之间的Alq3薄层对绿光的相对发光强度影响显著, 用很薄的Alq3层就可以得到强的绿光发射. 进一步改变器件结构, 利用有机超薄层就可以得到稳定的白光器件ITO/NPB(50 nm)/BCP(3 nm)/Alq3(3 nm)/Alq3:DCJTB(1%(w))(5 nm)/Alq3(7 nm)/Al. 随着电压的增加(14-18 V), 该器件的色坐标基本保持在(0.33, 0.37)处不动; 在432 mA·cm-2的电流密度下, 该器件的发光亮度可达11521 cd·m-2.     

White organic light-emitting diodes based on a combined electromer and monomer emission in doubly-doped polymers

We report on white organic light-emitting diodes(WOLEDs) based on polyvinylcarbazole(PVK) doped with 1,1-bis((di-4-tolylamino)phenyl)cyclohexane(TAPC) and perylene,and investigate the luminescence mechanism of the devices.The chromaticity of light emission can be tuned by adjusting the concentration of the dopants.White light with the Commission Internationale de L’Eclairage(CIE) coordinates of(0.33,0.34) is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK:TAPC:perylene(100:9:1 in wt.)(100 nm)/tris-(8-hydroxyquinoline aluminum(Alq 3)(10 nm)/Al.The device exhibits a maximal luminance of 3727 cd/m2 and a current efficiency of 2cd/A.     

White organic light-emitting diodes based on combined electromer and monomer emission in doubly-doped polymers

We report on white organic light-emitting diodes (WOLEDs) based on polyvinylcarbazole (PVK) doped with 1,1-bis((di-4-tolylamino)phenyl)cyclohexane (TAPC) and perylene, and investigate the luminescence mechanism of the devices. The chromaticity of light emission can be tuned by adjusting the concentration of the dopants. White light with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.33, 0.34) is achieved by mixing the yellow electromer emission of TAPC and the blue monomer emission of perylene from the device ITO/PVK: TAPC: perylene (100:9:1 in wt.) (100 nm)/tris-(8-hydroxyquinoline aluminum (Alq₃) (10 nm)/Al. The device exhibits a maximal luminance of 3727 cd/m² and a current efficiency of 2 cd/A.     

Effect of different metal-backed waveguides on amplified spontaneous emission

We investigate the effect of a metallic electrode on the ability for poly[2-methoxy-5-(2’-ethylhexyloxy)-1,4phenylene vinylene](MEH-PPV) film to undergo amplified spontaneous emission(ASE).The threshold of the device with Ag cladding is about 10 times greater than that of a metal-free device,but metal such as Al completely shuts off ASE.The ASE recurs when a thin spacer layer,such as a few nanometers of SiO 2,is introduced between the MEH-PPV film and the Al cladding.Compared with the Cu or Al electrode,the Ag cladding is most suited to serve as an electrode with its low optical loss due to its high work-function and reflectivity.     

基于激光位移测量技术的汽车侧滑台校准装置研究

针对汽车侧滑试验台动态检定和校准的实际需求,研制了一种基于激光位移测量技术的非接触式汽车侧滑试验台动静态校准装置。所提装置采用非接触式测量方法,利用了激光位移测量技术,同时采用丝杠运动控制技术,实现了侧滑量的非接触式测量,可以对汽车侧滑试验台动进行动态校准和静态校准。有效溯源表明,基于激光位移测量技术的所提装置完全达到并超过了JJG 908-2009《汽车侧滑检验台检定规程》对于标准器的计量技术指标要求。所提装置的使用及后续推广应用将有助于推动激光位移测量技术在高精度计量检测领域的应用,具有较高的示范作用和应用价值。     

BCP在多层有机电致发光器件中的作用

作为空穴阻挡材料,BCP通常被用在蓝光以及白光有机电致发光器件中,其空穴阻挡能力随着其厚度的增加而增强;另一方面,在电场作用下,空穴也能隧穿厚度较薄的BCP层。为了深入了解BCP在多层有机电致发光器件中的作用,文章研究了不同电压下BCP层厚度对器件ITO/NPB/BCP/Alq₃∶DCJTB/Alq₃/Al电致发光光谱的影响。实验发现,较薄的BCP层可以部分地阻挡空穴并能调节能量在不同发光层之间的传递,从而容易获得白光器件;但该种结构器件的电致发光光谱随着电压的变化变动较大。当BCP层足够厚时,器件的电致发光光谱也变得相对较稳定; 当BCP的厚度为15 nm以上时,空穴就很难再隧穿过去。文章还讨论了不同电压下多层器件的电致发光光谱发生变化的原因。