Optical properties, spectral narrowing of photoluminescence and blue electroluminescence of poly(phenylene pyridine) derivatives

Abstract

Optical properties of poly(phenylene pyridine) derivatives, poly(2,5-dialkoxy-1,4phenylenealt-2,5-pyridine) (PHOnPY25), such as optical absorption, photoluminescence (PL), and electroluminescence (EL), have been studied. The electronic energy structures of PHOnPY25 have been determined by optical and electrochemical measurements. Strong PL with high quantum efficiency has been clarified in the films, and spectral narrowing has been observed by pulse excitation of a nitrogen laser. Intense blue EL has also been demonstrated.

Optical properties and microring laser of conducting polymers with Sn atoms in main chains

“…The efficiency is comparable with previously reported efficiency of blue luminescent conducting polymers. [15][16][17] From time-resolved PL measurements, PL decay time at PL peak wavelength could be approximated by singleexponential decay: 18 I(t)ϭI 0 exp(Ϫt/), where I(t) is the PL intensity at time t, I 0 are the initial intensities, and are the lifetime constants, respectively. The evaluated PL lifetime constants of the polymers in films are also summarized in Table I.…”

“…Although some alternating copolymers have already been known as luminescent materials, such blue luminescent alternating copolymers with high quantum efficiencies 15,16 have hardly been reported. It should be emphasized that copolymers or conducting polymers with hetero atoms in main chains, such as SnPhFPV, could be candidates for blue luminescent materials for organic blue LEDs and blue lasers.…”

Synthesis and Electroluminescent Properties of New Conjugated Bithiazole-Containing Polymers

“…The optical band gaps for PNBTV, PBTPV6 and PNBTV6 were estimated to be 2.08 eV, 2.93 eV and 2.08 eV from an analysis of the absorption edge with a plot of (h ) versus ( h ) 2 , where , h and are the absorbance, Plank's constant and the frequency of light, respectively. 10 The LUMO energy levels Figure 3 shows the current density (J )-luminance (L) characteristics of Devices 1-3. All devices showed typical rectifying diode characteristics.…”

Exploratory Synthesis and Luminescence Study of the First π-Conjugated Tin-Based Alternating Copolymers for Blue Light-Emitting Diodes at the Very Low Operating Voltage

“…From optical data and cyclic voltammetric studies, the optical band gaps ( E g ) and the ionization potentials (HOMO level) for SnPhFPV and SnPhPVK were evaluated. The optical band gaps are estimated to be 2.68 eV for SnPhFPV and 2.71 eV for SnPhPVK from the analysis of the absorption edge with a plot of ( h ν) vs (α h ν) 2 , where α, h , and ν are the absorbance, Planck's constant, and the frequency of light, respectively . The electron affinities (LUMO level) of these polymers, approximated by subtracting the optical band gap from the ionization potentials (HOMO level) taken from cyclic voltammograms, are 3.20 eV for SnPhFPV and 2.90 eV for SnPhPVK.…”

“…The optical band gaps are estimated to be 2.68 eV for SnPhFPV and 2.71 eV for SnPhPVK from the analysis of the absorption edge with a plot of (hν) vs (Rhν) 2 , where R, h, and ν are the absorbance, Planck's constant, and the frequency of light, respectively. 17 The electron affinities (LUMO level) of these polymers, approximated by subtracting 9284 Baek et al Macromolecules, Vol. 35, No.…”