Blue-Greenish Electroluminescent Poly(p-phenylenevinylene) Developed for Organic Light-Emitting Diode Applications

Abstract

A novel electroluminescent poly(p-phenylenevinylene) (PPV) derivative was synthesized via the Gilch route, which emits in the blue-greenish region. The required monomer synthesis is a multistep process starting from catechol and does not involve any critical step. The polymer synthesis itself proceeds via standard Gilch conditions and results in constitutionally homogeneous and extraordinary high-molecular-weight PPVs. The characterization of these materials was carried out using nuclear magnetic resonance spectroscopy and size exclusion chromatography measurements. The highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels were estimated by combining information provided by cyclic voltammetry and UV−vis measurements. Finally, the electroluminescent behavior of the polymer was confirmed in an organic light-emitting diode.

Microwave-assisted synthesis of 4,9-linked pyrene-based ladder conjugated polymers

“…Conjugated polymers are still extensively studied in fields of organic light emitting diodes, solar cell, and sensor . Planar conjugated polymers such as ladder poly( p ‐phenylene)‐type polymers (LPPP) and graphite ribbon are special members of conjugated polymer family .…”

Synthesis and electro-optical properties of fluorene containing blue luminescent rod-coil homopolymers with pendant pyridine

“…The resulting solution was stirred at 50°C for 48 h. The product was extracted with dichloromethane followed by washing with brine. The solvent was dried over anhydrous MgSO 4 and removed by rotavapor. The crude product was purified by column chromatography on Al 2 O 3 using dichloromethane as eluent to yield white solid (1.3 g, 89 %).…”

“…After the discovery of electroluminescence in a polymeric semiconductor, a large effort has been made to synthesize polymers with different chromophoric moieties which make OLED-based technology a possible alternative to liquid crystal-based displays. Lately, considerable progress has been documented in several papers to develop OLED displays for other niche lighting applications [4,5]. Red, green, * E-mail: duryosahu@gmail.com and blue emitters are the prime requirements for the fabrication of full-color displays.…”

“…Red, green, * E-mail: duryosahu@gmail.com and blue emitters are the prime requirements for the fabrication of full-color displays. The stability and efficiency of green and red emitters have approached commercially viable levels [4][5][6][7]. The search for blue luminophores with high emission efficiency is a subject of current interest, as they are essential in high quality full color displays and white lighting [8,9].…”

Highly Efficient All-Solution-Processed Fluorescent Organic Light-Emitting Diodes Based on a Novel Self-Host Thermally Activated Delayed Fluorescence Emitter

“…At present, the biggest challenge in the development of OLEDs is reduction of the manufacturing cost. Compared with vacuum-deposition, solution-process techniques are more suitable for low cost and large area fabrication. , However, the efficiencies of solution-processed OLEDs are generally low, especially for fluorescence devices. − Recently, many efforts have been devoted to develop thermally activated delayed fluorescent (TADF) materials, − which can achieve 100% internal quantum efficiency (IQE) through reverse intersystem crossing (RISC) from triplet state (T 1 ) to singlet state (S 1 ). Some important studies of TADF OLEDs fabricated by solution processing technique have been reported and the device efficiencies of them can even comparable to their vacuum-deposited counterparts. , Unfortunately, although the emission layers (EML) of these devices are fabricated by spin-coating, the electron transporting layers (ETL) are still deposited by vacuum evaporation, which inevitably increases the manufacturing cost and complexity.…”