基于CBP:BCzVB:Btp2Ir(acac)体系的白色有机电致发光器件色度飘移研究

以苯乙烯类化合物BCzVB为蓝色荧光染料,以铱配合物Btp_2Ir(acac)为红色磷光染料,共掺杂到CBP基质中作为发光层,制备了白色有机电致发光器件,研究了该体系发光色度漂移的原因。器件在掺杂CBP:6?zVB: 0．2%Btp_2Ir(acac),在．驱动电流从4～200 mA/cm~2变化范围内,发光色坐标从(0．340,0．273)飘移到(0．308, 0．273),色坐标轻微蓝移。对器件发光光谱和亮度-电流密度曲线等分析表明:器件色度的轻微蓝移是由于CBP基质向Btp_2Ir(acac)掺杂剂完全的能量传递、荧光染料BCzVB向磷光染料Btp_2Ir(acac)不完全的能量传递等内在物理过程和磷光染料Btp_2Ir(acac)自身发光饱和等特性共同决定的。     

基于红色荧光染料3-(dicyanomethylene)-5, 5-dimethyl-1-(4-dimethylamino-styryl) cyclohexene的高性能白色有机电致发光器件

研究了基于红色荧光染料3-（dicyanomethylene）-5, 5-dimethyl-1-（4-dimethylamino-styryl） cyclohexene（DCDDC）的白色有机电致发光器件的性能,分别制备了基于DCDDC超薄层和DCDDC掺杂主体材料的两种器件结构: 1）indium-tin oxide（ITO）/N, N′-diphenyl-N, N′-bis（1-naphthyl-pheny1）-1, 1′-biphenyl-4, 关键词： 有机电致发光器件 白色发光 红色荧光染料 掺杂     

不同主体双发光层白色有机电致发光器件的性能研究

制备了结构为ITO/NPB/CBP:TBPe:rubrene/BAlq:Ir(piq)₂(acac)/BAlq/Alq₃/Mg:Ag的白色磷光有机电致发光器件.利用两种不同的主体材料,即用双载流子传输型主体材料CBP掺杂荧光染料TBPe及rubrene作为蓝光和橙黄光发光层;用电子传输型主体材料BAlq掺杂磷光染料Ir(piq)₂(acac)作为红色发光层.以上双发光层夹于空穴传输层NPB与具有电子传输性的阻挡层BALq之间.讨论了如何控制 关键词： 有机电致发光 磷光染料 掺杂 白光     

掺闪烁体PMMA的超荧光发射

激光技术的出现,使掺稀土离子的晶态和非晶态固体无机材料得到发展.而以非晶态固体有机材料为基质的工作物质,至今未见报导.许多有机高分子材料,是良好的介电质材料,但是,用作光学材料,近年来才开始.如用作镜片、光纤和某些功能材料.有关掺杂发光物质的有机高分子材料,除少量用于装璜的发光塑料外,也研究得极少.基于把基质有机高分子视为刚性溶剂的考虑,我们在进行闪烁体染料溶液体系研究的同时,进行了掺闪烁体PMMA体系的发光和发光稳定性的实验研究,作为对这一领域进行初步探索,得到了有意义的实验结果.     

有机混合薄膜中的Frster能量转移

通过掺杂不同的染料有机电致发光器件可以得到不同颜色的光发射。掺杂小分子有机材料苝酸四甲酯perylene- 3,4,9,10 -tetracarboxylicacid(TMEP)到蓝色发光聚合物poly(N -vinyl carbazole)聚乙烯基咔唑(PVK),得到了很好的绿光发射。TEMP掺杂质量分数为0.01时,295. 5nm激发波长的荧光光谱可以明显观察到在420 nm处PVK和530 nm处TEMP的发射峰值;当TMEP掺杂质量分数达到0.050.10之间,器件的电致发光光谱和荧光光谱发射峰几乎完全被TEMP的绿光所占据。光谱的转移归因于从聚合物PVK到小分子有机材料TMEP的F -rster能量转移。荧光光谱中随着TMEP掺杂浓度的的增大发射峰值有明显的红移,这种现象被归因于在TMEP高浓度掺杂情况下激基缔合物的形成。激基缔合物的形成从TMEP在薄膜状态下与溶液状态下的荧光光谱的比较中得到证实。     

有机混合薄膜中的F(o)rster能量转移

通过掺杂不同的染料有机电致发光器件可以得到不同颜色的光发射。掺杂小分子有机材料?p酸四甲酯perylene-3,4,9,10-tetracarboxylicacid(TMEP)到蓝色发光聚合物poly(N-vinyl-carbazole)聚乙烯基咔唑(PVK),得到了很好的绿光发射。TEMP掺杂质量分数为0.01时,295. 5nm激发波长的荧光光谱可以明显观察到在420 nm处PVK和530 nm处TEMP的发射峰值;当TMEP掺杂质量分数达到0.05～0.10之间,器件的电致发光光谱和荧光光谱发射峰几乎完全被TEMP的绿光所占据。光谱的转移归因于从聚合物PVK到小分子有机材料TMEP的Forster能量转移。荧光光谱中随着TMEP掺杂浓度的的增大发射峰值有明显的红移,这种现象被归因于在TMEP高浓度掺杂情况下激基缔合物的形成。激基缔合物的形成从TMEP在薄膜状态下与溶液状态下的荧光光谱的比较中得到证实。     

紫外转化的PPV薄膜电致发光性质的研究

PPV是一种常用的高荧光效率的黄绿色的电致发光共轭聚合物,因为PPV不易溶解于有机溶剂,所以在有机电致发光(OLEDs)中PPV薄膜的制备通常是PPV的预聚体旋涂成膜,然后在高温、真空条件下转化成PPV薄膜。这种高温转化制膜的方法无法对其进行掺杂,限制了PPV在OLED中的应用。文章利用紫外光照射,PPV预聚体薄膜在室温和真空条件下转化成PPV薄膜,它与热处理得到的PPV薄膜的光致发光(PL)和拉曼(Raman)光谱一致;利用这种方法制备了非掺杂和红色荧光染料掺杂的有机电致发光器件,实现了以PPV为主体和能量给体的不同染料的掺杂发光,并获得绿色和橙色的电致发光。电致发光器件的发光效率和发光强度还有待进一步提高。     

掺杂型红色有机电致发光显示器件

全色显示是有机电致发光显示(OLED)器件发展的目标,而高性能红色发光器件一直是制约全彩色OLED器件实用化的瓶颈,也是目前有机电致发光显示研究的热点。制作了掺杂DCJTB和不同浓度的rubrene两种荧光染料的红色有机电致发光显示器件,以NPB和Alq₃分别作为空穴传输层和电子传输层,发现器件性能与只掺杂DCJTB的器件相比有明显提高,发光效率提高到2～3倍。通过Frster理论和能带理论分析了器件的能量转移机理,研究发现Frster能量转移不是掺杂器件能量转移的主要形式,载流子俘获机制才是器件效率提高的主要原因;rubrene的引入使得能量能够更有效地从Alq₃转移到DCJTB,从而显著地提高了器件的发光效率和性能。     

有机混合薄膜中的Foerster能量转移

通过掺杂不同的染料有机电致发光器件可以得到不同颜色的光发射。掺杂小分子有机材料苝酸四甲酯perylene-3，4，9，10-tetracarboxvlicacid(TMEP)到蓝色发光聚合物poly(N—vinyl—carbazole)聚乙烯基咔唑(PVK)，得到了很好的绿光发射。TEMP掺杂质量分数为0．01时，295．5nm激发波长的荧光光谱可以明显观察到在420nm处PVK和530nm处TEMP的发射峰值；当TMEP掺杂质量分数达到0．05～0．10之间，器件的电致发光光谱和荧光光谱发射峰几乎完全被TEMP的绿光所占据。光谱的转移归因于从聚合物PVK到小分子有机材料TMEP的Foerster能量转移。荧光光谱中随着TMEP掺杂浓度的的增大发射峰值有明显的红移，这种现象被归因于在TMEP高浓度掺杂情况下激基缔合物的形成。激基缔合物的形成从TMEP在薄膜状态下与溶液状态下的荧光光谱的比较中得到证实。     

同时掺杂磷光和荧光染料的白色有机电致发光器件性能研究

以磷光染料Ir(piq)₂(acac)作为发光掺杂剂,掺入空穴传输性主体材料NPB中得到红色发光层,荧光材料TBP掺入到主体CBP中作为蓝色发光层,制备了结构为ITO/NPB/NPB：Ir(piq)₂(acac)/CBP/CBP：TBPe/BCP/ALq/Mg：Ag的双发光层白色有机电致发光器件.其中ALq₃、未掺杂的NPB和CBP及BCP层分别作为电子传输层、空穴传输层和激子阻挡层.实验中通过调节发光层厚度及Ir(piq)_{2关键词： 磷光 激子阻挡层 有机电致发光}     

NLOphoric Red Emitting Bis Coumarins with O-BF<Subscript>2</Subscript>-O core - Synthesis,Photophysical Properties and DFT Studies

The red emitting dyes were synthesized by employing coumarin core as a donor and boron-bonded coumarin as an acceptor. 7-(N,N-Diethylamino)-coumarin 3-aldehyde was reacted with 3-acetyl-4-hydroxy-coumarin, 7-(N,N-diethylamino)-3-acetyl-4-hydroxy-coumarin and 3-acetyl-4-hydroxy-1-methyl-quinolone to form the corresponding chalcones. The synthesized chalcones were though red shifted as compared to the parent coumarin, and were not emitting in red region. The BF₂-complexation was used as a tool to introduce a red shift in the molecules. The BF₂-complexes synthesized were found to be red emitting and show higher one photon absorption cross section. The solvatochromism shown by these dyes was studied in the light of solvent polarity parameters. DFT calculations were used to understand the photophysical properties of the synthesized dyes. NLO properties of the dyes were estimated by solvatochromic and computational methods. All the molecules synthesized were characterised with the HRMS and NMR spectral Analysis.     

AIE Based Coumarin Chromophore - Evaluation and Correlation Between Solvatochromism and Solvent Polarity Parameters

A new class of red emitting extensively conjugated donor-π-acceptor type dyes bearing coumarin units have been synthesized by condensation of 7-(diethylamino)-2-oxo-2 H-chromene-3-carbaldehyde with different active methylenes. All the dyes are characterized by ¹H NMR, ¹³C NMR and HRMS spectroscopy. The photophysical behaviour and the relation between structure and properties of the coumarin “push–pull” derivatives were investigated experimentally. The dyes exhibited positive solvatochromism and solvatofluorism in solution of varying polarity. These coumarin dyes show aggregation induced emission properties with red emitting fluorescence. They show absorption in the range of 501–528 and emission in the range of 547–630 nm. We evaluated photophysical properties of coumarin dyes using solvotochromism and solvent dependent shift in the emission wavelength. All the synthesized coumarin dyes COS1-COS4 are showing very good solvatochromic properties.     

发光层掺杂对红光OLED性能影响研究

制备高效率、高亮度的红光有机发光二极管是显示器实现全彩色的关键,对高性能的红光有机发光二极管器件研究具有十分重要的意义.本文主要研究了掺杂剂(DCJTB)浓度对红光有机发光二极管性能影响.实验采用真空热蒸镀的方法,选取结构为ITO／2-TNATA(20 nm)/NPB(30 nm)/AlQ(50 nm):(X%)DCJTB／AlQ(30 nm)／LiF(0.8 nm)／Al(100 nm)的红光器件,在高准确度膜厚控制仪的监控下,实现了有机薄膜功能材料的精确蒸镀.研究表明:红光掺杂剂掺杂浓度为(2.5~3.0)%时,在12 V电压下,可以得到发光亮度最高达到8 900 cd/m²,发光效率大于2.8 cd/A,且发光光谱波长为610~618 nm较为理想的红光有机发光二极管器件.     

白色有机发光器件及其稳定性

报道了一种稳定的白色有机薄膜电致发光器件.电流效率6cd/A,在电流密度20mA/cm²驱动下,亮度为1026cd/m²;最高亮度21200cd/m²,色度(x=0.32,y=0.40).该器件具有较平稳的效率电流关系,即具有弱的电流荧光猝灭.初始亮度100cd/m²下,半亮度寿命达22245h.     

Near-Infrared Spectroscopy Probe with Position Sensor

We propose a probe for near-infrared spectroscopy that enables exploratory diagnosis and the simultaneous measurement of metabolic status and dynaMisc of the body of a subject. The probe has a red light emitting diode for indicating its position in addition to a set of two near-infrared light emitting diodes and a photodetector for near-infrared spectroscopy measurement. The red light is detected by a camera and the probe position is obtained by processing the captured images. There are two methods of using the probe: In one method, the user scans the probe on the body surface to obtain a spatial distribution of metabolic status; in the other method, the probe is fixed on the body and simultaneously measures metabolic status and movement of the body to investigate their relationship.     

食用天然辣椒红色素中掺杂苏丹红的红外光谱快速识别

如何快速检测天然色素中是否掺杂合成色素或者工业染料是食品分析检测中的一个难题。天然辣椒红色素因兼具着色和药理功效而被广泛用于食品中,但又因其稳定性较差而被不法商贩掺杂苏丹红来获利。本文利用红外光谱技术的宏观指纹特性,对掺杂于天然辣椒红色素中苏丹红的1 621,1 500和751cm-1处的强峰,再通过二阶导数图谱分析将谱图信息放大,辅以指纹区684和496cm-1处的谱峰的佐证,可以快速识别辣椒红中是否添加有苏丹红,检测限量可以达到1%。     

Macromolecular nanoelectronics

We have explored new organic materials and fabrication methods to fabricate organic photodiodes and light emitting diodes. Grafting of a fullerene derivative to a polythiophene backbone yielded an integrated acceptor-donor polymer that we used as the active material in organic photodiodes. Using a method of soft lithography, soft embossing, we fabricated submicron structures to be used as organic light emitting diodes. Employing a silicone rubber replica (stamp) of an optical diffraction grating we transferred the grating pattern to an organic resist layer by placing the stamp in conformal contact with the resist. The transferred pattern was subsequently used as an etch mask for the processing of the device. The structures were successfully utilized as light emitting diodes and photodiodes, with device characteristics influenced by the imposed structure.     

新型有机电致磷光白光器件的研究

制备了结构为ITO/NPB/TCTA/FIrpic∶TCTA/Ir(MDQ)2(acac)∶TmPyPB/FIrpic∶TmPyPB/TmPyPB/LiF/Al的有机电致磷光发光器件。通过在双蓝光发光层之间插入较薄的红光层Ir(MDQ)2(acac)∶TmPyPB调节载流子、激子在各发光层中的分布,并结合TCTA和TmPyPB对发光层内载流子和激子的有效阻挡作用,混合实现白光发射。研究了红光层在不同厚度、不同掺杂浓度下对器件发光性能的影响。结果表明,红光发光层厚度为2nm、质量浓度为5%时,结合蓝光发光层和红光发光层,实现了色坐标为(0.333,0.333)、最大发光效率为11.50cd/A的白光发射。     

ITO‐free top emitting organic light emitting diodes with enhanced light out‐coupling

Bottom emitting organic light emitting diodes (OLEDs) can suffer from lower external quantum efficiencies (EQE) due to inefficient out‐coupling of the generated light. Herein, it is demonstrated that the current efficiency and EQE of red, yellow, and blue fluorescent single layer polymer OLEDs is significantly enhanced when a MoO_x(5 nm)/Ag(10 nm)/MoO_x(40 nm) stack is used as the transparent anode in a top emitting OLED structure. A maximum current efficiency and EQE of 21.2 cd/A and 6.7%, respectively, was achieved for a yellow OLED, while a blue OLED achieved a maximum of 16.5 cd/A and 10.1%, respectively. The increase in light out‐coupling from the top‐emitting OLEDs led to increase in efficiency by a factor of up to 2.2 relative to the optimised bottom emitting devices, which is the best out‐coupling reported using solution processed polymers in a simple architecture and a significant step forward for their use in large area lighting and displays.