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In this paper, the electroluminescence quenching mechanism
in a 5,6,11,12-tetraphenylnaphthacene (Rubrene) doped host--guest
system is studied by utilizing a specially designed organic
light-emitting diode with an emission layer consisting of a few
periodic host/guest structures. Tris-(8-hydroxyquinoline) aluminium
(Alq3) and Rubrene are used as the host and the guest,
respectively. The thickness variation of the guest layer in each
period enables the study of the effect of molecule aggregation, and
the thickness variation of the host layer suggests a long range
quenching mechanism of dipole--dipole interaction. The long range
quenching mechanism is a F?rster process, and the F?rster
radius of Rubrene is between 3 and 10~nm. 相似文献
66.
使用二苯甲酰甲烷-二苯菲罗啉-铕(Eu(DBM)3BPhen)作为电子给体和[6,6]-苯基-C61-丁酸酸甲酯([60]PCBM)作为电子受体制备了一种新型的有机光盲型紫外探测器.在光强为2.1 mW cm-2且波长为360 nm的紫外光照射下,获得了26 mA W-1的响应度和9.1%的外量子效率,这是由于Eu(DBM)3BPhen的强紫外光吸收能力和长达300μs的激子寿命使得给受体界面处具有较高的激子解离率.在把[60]PCBM掺入Eu(DBM)3BPhen后,观察到了明显的光致发光猝灭和光电导现象.由于材料较低的载流子迁移率和受陷激子的缓慢释放,在紫外光照射关闭后,观察到了较强的持续光电导现象. 相似文献
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在荧光材料中掺杂合适的磷光敏化剂,可以大大提高荧光有机电致发光器件(OLED)的效率。选择磷光材料知fac-tris(2-phenylpyridinato-N,C^2′)iridium(Ⅲ)(Ir(ppy)3)分别与荧光材料4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl(DCJTB)、5,6,11,12,-tetraphenylnaphthacene(Rubrene)掺杂作为发光层,当掺杂质量比合适时,磷光材料的发光消失,得到了纯正的荧光材料的发光。同时,对磷光材料的敏化作用及发光机制进行了分析,比较了Ir(ppy)3对两种不同荧光材料的敏化作用强弱,发现Ir(ppy)3对荧光材料Rubrene的敏化作用更强。对影响敏化作用的因素进行了分析,推测其原因与磷光材料和荧光材料的相容性质有关。 相似文献
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采用有机磷光材料三-(2-苯基吡啶)-铱(Ir(PPY)3)与无机材料SiO2复合制成夹层结构器件,用交流电压驱动获得了Ir(PPY)3主峰位于517nm的发光和主峰位于435nm的蓝色发光.通过分析器件的光谱特性,发现这两个发光峰都是源于SiO2中加速电子直接碰撞激发有机层引起的固态阴极射线发光.继实现多种有机聚合物材料和有机小分子材料八羟基喹啉铝(Alq3)的固体阴极射线发光之后,又证实了有机
关键词:
夹层结构器件
有机磷光材料
固态阴极射线发光 相似文献
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用Si3N4作为电子加速层制备了固态阴极射线发光器件,其中发光层为聚[2-甲氧基-5-(2-乙基-己氧基)-1,4-苯撑乙烯撑](MEH-PPV).在交流电压的驱动下,实现了MEH-PPV的固态阴极射线发光.与SiO2做电子加速层的器件进行了对比研究,两种器件在交流电场的驱动下都得到了波峰位于417 nm的短波长发光峰,它来自有机物中电子从最低未占分子轨道到最高占据分子轨道的直接复合发光,这进一步证明了固态阴极射线理论的正确性.在交流高场下比较了Si3N4和SiO2的电子加速能力,发现SiO2的电子加速能力要优于Si3N4的电子加速能力. 相似文献
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The concentration quenching and crystallographic sites of Eu<sup>2+</sup> in Ca<sub>2</sub>BO<sub>3</sub>Cl 下载免费PDF全文
A yellow phosphor, Ca2BO3 Cl:Eu2+ , is prepared by the high-temperature solid-state method. Under the condition of excitation sources ranging from ultraviolet to visible light, efficient yellow emission can be observed. The emission spectrum shows an asymmetrical single intensive band centred at 573 nm, which corresponds to the 4f 6 5d 1 →4f 7 transition of Eu2+ . Eu2+ ions occupy two types of Ca2+ sites in the Ca2BO3 Cl lattice and form two corresponding emission centres, respectively, which lead to the asymmetrical emission of Eu2+ in Ca2 BO 3 Cl. The emission intensity of Eu2+ in Ca2BO3 Cl is influenced by the Eu2+ doping concentration. Concentration quenching is discovered, and its mechanism is verified to be a dipole–dipole interaction. The value of the critical transfer distance is calculated to be 2.166 nm, which is in good agreement with the 2.120 nm value derived from the experimental data. 相似文献