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Effect of dendron structure on the luminescent and charge transporting properties of solution processed dendrimer-based OLEDs
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-11-10 , DOI: 10.1039/d1tc03949k Mile Gao 1 , Van T. N. Mai 1 , Junhyuk Jang 1 , Chandana Sampath Kumara Ranasinghe 1 , Ronan Chu 1 , Paul L. Burn 1 , Ian R. Gentle 1 , Almantas Pivrikas 2 , Paul E. Shaw 1
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-11-10 , DOI: 10.1039/d1tc03949k Mile Gao 1 , Van T. N. Mai 1 , Junhyuk Jang 1 , Chandana Sampath Kumara Ranasinghe 1 , Ronan Chu 1 , Paul L. Burn 1 , Ian R. Gentle 1 , Almantas Pivrikas 2 , Paul E. Shaw 1
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The photophysical and charge transport properties of neat and blend films of fac-tris[2-phenylpyridinato-C2,N]iridium(III) [Ir(ppy)3]-cored light-emitting dendrimers and tris(4-carbazoyl-9-ylphenyl)amine (TCTA)-based hosts, with each combination having the same first generation dendrons were measured and compared. The first generation dendrons were composed of bis(fluorenyl)carbazolyl with n-propyl surface groups, or biphenyl with 2-ethylhexyloxy or t-butyl surface groups. Dendronisation of the emitter and host was found to decrease the energy transfer efficiency from the host to the guest relative to an evaporated Ir(ppy)3:TCTA blend film, with the blend composed of materials with biphenyl dendrons and t-butyl surface groups having the largest decrease. The hole mobilities of the solution processed neat and blend layers were found to be 1–2 orders of magnitude lower than those of the equivalent evaporated films. The blend film containing the host and dendrimer with first generation biphenyl dendrons and 2-ethylhexyloxy surface groups had the highest photoluminescence quantum yield (PLQY), comparable to evaporated Ir(ppy)3:TCTA-based films but the lowest hole mobility (≈10−8 cm2 V−1 s−1). In contrast, the blend with the dendrimers composed of the bis(fluorenyl)carbazolyl dendrons with n-propyl surface groups had a low PLQY but higher hole mobility. It was found for the combinations of these solution processable materials that the hole mobility of the blend film was the limiting factor in OLED performance. Devices containing an emissive layer of the materials with the bis(fluorenyl)carbazolyl dendrons with n-propyl surface groups (11 mole percent of the emitter) had a PLQY of 40.8% but the highest external quantum efficiency of 10.0 ± 0.4%, reaching a maximum luminance of almost 10 000 cd m−2.
中文翻译：
树枝状结构对溶液加工的树枝状大分子有机发光二极管发光和电荷传输性能的影响
fac -tris [2- phenylpyridinato- C 2 , N ]iridium( III ) [Ir(ppy) 3 ]-核发光树枝状聚合物和tris(4-carbazoyl-9 )的纯膜和共混膜的光物理和电荷传输特性测量并比较了基于-基苯基)胺 (TCTA) 的宿主，每种组合都具有相同的第一代树枝状结构。第一代树枝状化合物由具有正丙基表面基团的双(芴基)咔唑基或具有2-乙基己氧基或叔丁基表面基团的联苯组成。与蒸发的 Ir(ppy) 3相比，发现发射体和主体的树枝化会降低从主体到客体的能量转移效率：TCTA共混膜，其中含有联苯树枝状分子和叔丁基表面基团的材料组成的共混物下降幅度最大。发现处理过的纯层和混合层的溶液的空穴迁移率比等效的蒸发膜低 1-2 个数量级。包含主体和树枝状聚合物的共混膜具有第一代联苯树突和 2-乙基己氧基表面基团，具有最高的光致发光量子产率 (PLQY)，与蒸发的 Ir(ppy) 3 :TCTA 基薄膜相当，但空穴迁移率最低（≈10 −8 cm 2 V −1 s −1 )。相比之下，与由具有n-丙基表面基团具有低PLQY但更高的空穴迁移率。发现对于这些溶液可加工材料的组合，共混膜的空穴迁移率是OLED性能的限制因素。包含具有正丙基表面基团的双（芴基）咔唑基树枝状化合物（发射体的 11 摩尔百分比）材料发射层的器件具有40.8% 的 PLQY，但最高外部量子效率为 10.0 ± 0.4%，达到了最大亮度几乎为 10 000 cd m -2。
更新日期：2021-11-10
中文翻译：
树枝状结构对溶液加工的树枝状大分子有机发光二极管发光和电荷传输性能的影响
fac -tris [2- phenylpyridinato- C 2 , N ]iridium( III ) [Ir(ppy) 3 ]-核发光树枝状聚合物和tris(4-carbazoyl-9 )的纯膜和共混膜的光物理和电荷传输特性测量并比较了基于-基苯基)胺 (TCTA) 的宿主，每种组合都具有相同的第一代树枝状结构。第一代树枝状化合物由具有正丙基表面基团的双(芴基)咔唑基或具有2-乙基己氧基或叔丁基表面基团的联苯组成。与蒸发的 Ir(ppy) 3相比，发现发射体和主体的树枝化会降低从主体到客体的能量转移效率：TCTA共混膜，其中含有联苯树枝状分子和叔丁基表面基团的材料组成的共混物下降幅度最大。发现处理过的纯层和混合层的溶液的空穴迁移率比等效的蒸发膜低 1-2 个数量级。包含主体和树枝状聚合物的共混膜具有第一代联苯树突和 2-乙基己氧基表面基团，具有最高的光致发光量子产率 (PLQY)，与蒸发的 Ir(ppy) 3 :TCTA 基薄膜相当，但空穴迁移率最低（≈10 −8 cm 2 V −1 s −1 )。相比之下，与由具有n-丙基表面基团具有低PLQY但更高的空穴迁移率。发现对于这些溶液可加工材料的组合，共混膜的空穴迁移率是OLED性能的限制因素。包含具有正丙基表面基团的双（芴基）咔唑基树枝状化合物（发射体的 11 摩尔百分比）材料发射层的器件具有40.8% 的 PLQY，但最高外部量子效率为 10.0 ± 0.4%，达到了最大亮度几乎为 10 000 cd m -2。
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