Realization of Red Iridium-Based Ionic Transition Metal Complex Light-Emitting Electrochemical Cells (iTMC-LECs) by Interface-Induced Color Shift

Frohleiks, Julia; Wepfer, Svenja; Bacher, G.; Nannen, Ekaterina

doi:10.1021/acsami.9b07019

Cited by 21 publications

(25 citation statements)

References 55 publications

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“…In the white organic light-emitting devices (WOLEDs) photoluminescent (PL) organic π-conjugated systems play the leading role. On the other hand, the use of transition metal complexes as emitters in Light-Emitting Diodes (LEDs) technology is well known [1,2,3]. Due to their excellent PL properties and vivid colors, the rare earths ions have been the first choice for LEDs and white LEDs (WLEDs) [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient White Luminescent Zinc (II) Based Metallopolymer by RGB Approach

2019

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Three aryl-hydrazone O,N,O tridentate ligands with a different electron-withdrawing substituent were prepared. The introduction of a flexible charged chain in the ligands guaranteed solubility in many organic solvents and in water. The increasing withdrawing aptitude of the substituents red-shifted the emission in the correspondent metallopolymers. The metallated polymers were obtained by grafting ligand-zinc (II) coordination fragments onto commercial poly-(4-vinylpyridine). Metallopolymers thin films exhibited red, green and blue emission colors defined by Commission Internationale d’Eclairage (CIE) coordinates and medium to excellent photoluminescence (PL) quantum yields (PLQYs) comparable with other highly-performing active materials for Light-Emitting Diodes (LEDs). By grafting a suitable mix of the three different coordination pendants, an efficient single-component white emissive metallopolymer with CIE (0.30, 0.31) was prepared. Thanks to the charged moiety, the polymers resulted miscible with an ionic liquid. The addition produced homogeneous polymeric layers with unaltered PL performances, potentially employable in Light-emitting Electrochemical Cells (LECs).

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Section: Introductionmentioning

confidence: 99%

A Highly Efficient White Luminescent Zinc (II) Based Metallopolymer by RGB Approach

2019

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“…After this first report on iTMC LECs, various types of iTMCs, such as ruthenium and iridium complexes, have been applied to LECs, [68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85] resulting in a high luminance, [68][69][70][71] long lifetime, [72][73][74][75][76] and fundamental understanding of their operation mechanism. [12,77,78] Moreover, there is an interesting report on the solution fabrication of flexible white LECs for future applications.…”

Section: Inorganic Transition Metal Complex (Itmc) Lecsmentioning

confidence: 99%

Recent Progress on Light‐Emitting Electrochemical Cells with Nonpolymeric Materials

Matsuki

Takenobu

2020

Adv Funct Materials

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Light-emitting electrochemical cells (LECs) have emerged as some of the simplest light-emitting devices. Indeed, numerous LECs have been produced using fluorescent polymers; however, initial LEC This article is protected by copyright. All rights reserved. 2structures require a mixture of polymers and electrolytes, thus strictly limiting their applicability. In contrast, recent advances in device technologies and material synthesis have opened a route for LECs using nonpolymeric materials. This progress report focuses on current developments in the device concepts, mechanisms, and characteristics of LECs that allow the utilization of nonpolymeric materials.First, the three primary device types, namely, electrochemically doped, ionic-material, and electrostatically doped LECs, are categorized, and their distinct features are described. Second, electrochemically doped LECs based on small molecules and branched molecules are introduced.Then, an overview of the rapidly growing field of ionic-material LECs, especially ionic transition metal complexes, ionic small molecules and perovskites, and their characteristics are provided. Following these results, recent achievements in solid-state materials, such as inorganic single crystals, quantum dots, and two-dimensional materials, as electrostatically doped LECs are highlighted. Finally, an overview and evaluation of these LECs reveal the key directions and remaining issues that must be overcome to further functionalize LECs, which provide a versatile approach for new lighting applications comprising emergent materials.

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“…Hole injection at the oxide/organometallic interfaces, which form the basic structure of the LEC device and allow the light to be formed and emitted here, is a crucial parameter that affects the performance of the device [15][16][17][18][19][20][21]. The transparent conductive oxide, indium tin oxide (ITO), which forms the anode electrode of this interface in LEC, is a factor that limits the performance of the device because it is both rough and unsuitable for hole injection [22][23][24]. To overcome such problems, PEDOT: PSS is formed at the interface of the organometallic light-emitting layer with the ITO.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2022

IJOE

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The purpose of the work is to understand how to effect the interface PEDOT: PSS on the hole mobility of the LEC device by Space Charge Limited Current (SCLC) approaches technique. PEDOT: PSS plays a significant role in organic electronics device as interface modification, particularly on Light-emitting electrochemical cells (LEC) due to fundamental structure of hole only device. This study analyses the hole mobility of the device based on current-voltage characteristic approach at room temperature. It has been observed that the PEDOT: PSS interface increases the hole mobility of the LEC device by a factor of 10 8 .

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Realization of Red Iridium-Based Ionic Transition Metal Complex Light-Emitting Electrochemical Cells (iTMC-LECs) by Interface-Induced Color Shift

Cited by 21 publications

References 55 publications

A Highly Efficient White Luminescent Zinc (II) Based Metallopolymer by RGB Approach

A Highly Efficient White Luminescent Zinc (II) Based Metallopolymer by RGB Approach

Recent Progress on Light‐Emitting Electrochemical Cells with Nonpolymeric Materials

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