Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally-Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores

被引：31

作者：

Haldar, Ritesh ^{[1
]}

Jakoby, Marius ^{[2
]}

Kozlowska, Mariana ^{[3
]}

Rahman Khan, Motiur ^{[4
]}

Chen, Hongye ^{[1
,5
]}

Pramudya, Yohanes ^{[3
]}

Richards, Bryce S. ^{[2
,4
]}

Heinke, Lars ^{[1
]}

Wenzel, Wolfgang ^{[3
]}

Odobel, Fabrice ^{[6
]}

Diring, Stephane ^{[6
]}

Howard, Ian A. ^{[2
,4
]}

Lemmer, Uli ^{[2
,4
]}

Woell, Christof ^{[1
]}

机构：

[1] Karlsruhe Inst Technol KIT, Inst Funct Interfaces IFG, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[2] Karlsruhe Inst Technol KIT, Inst Microstruct Technol IMT, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[3] Karlsruhe Inst Technol KIT, Inst Nanotechnol INT, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany

[4] Karlsruhe Inst Technol KIT, Light Technol Inst LTI, Engesserstr 13, D-76131 Karlsruhe, Germany

[5] Inst Nano Sci, Minist Educ, Key Lab Intelligent Nano Mat & Devices, State Key Lab Mech & Control Mech Struct, Nanjing, Peoples R China

[6] Univ Nantes, CEISAM, UMR 6230, CNRS,Chim & Interdisciplinarite Synth,Anal,Modeli, F-4400 Nantes, France

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2020年 / 26卷 / 71期

关键词：

aggregation; electroluminescence; epitaxial thin film; metal– organic frameworks; thermally activated delayed fluorescence; METAL-ORGANIC FRAMEWORK; UP-CONVERSION; EMISSION; DESIGN;

D O I：

10.1002/chem.202003712

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Several photophysical properties of chromophores depend crucially on intermolecular interactions. Thermally-activated delayed fluorescence (TADF) is often influenced by close packing of the chromophore assembly. In this context, the metal-organic framework (MOF) approach has several advantages: it can be used to steer aggregation such that the orientation within aggregated structures can be predicted using rational approaches. We demonstrate this design concept for a DPA-TPE (diphenylamine-tetraphenylethylene) chromophore, which is non-emissive in its solvated state due to vibrational quenching. Turning this DPA-TPE into a ditopic linker makes it possible to grow oriented MOF thin films exhibiting pronounced green electroluminescence with low onset voltages. Measurements at different temperatures clearly demonstrate the presence of TADF. Finally, this work reports that the layer-by-layer process used for MOF thin film deposition allows the integration of the TADF-DPA-TPE in a functioning LED device.

引用

页码：17016 / 17020

页数：5

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