A Binaphthyl-Bithiophene Copolymer for Light-Emitting Devices

Binaphthyl‐Containing Green‐ and Red‐Emitting Molecules for Solution‐Processable Organic Light‐Emitting Diodes

“…To date, binaphthyl-containing polymers, [11][12][13][14] dendrimers, [15,16] and small organic molecules [17][18][19] have already been widely used in chiral sensors, [20][21][22][23] unsymmetrical catalysis, [24][25][26][27] photochromic application, [28][29][30] and nonlinear optical materials; [31,32] but in recent years binaphthyl-containing materials have also been successfully employed as blue-emitter in electroluminescent (EL) devices. [11][12][13][14]17,18,[33][34][35][36][37][38][39][40] Yet, greenand red-emitting materials based on binaphthyl-containing molecules (BNCMs) are rarely reported so far.…”

Facile synthesis and properties of binaphthyl-containing blue light emitting materials

“…The onset potentials for oxidation of BNOAV, BNONV and BNOBPV were obtained, respectively, to be 1.0, 1.1, 1.2 V (vs. Ag wire), which were quite close to those of other compounds containing binaphthyl units [5][6][7][8][9]. On the other hand, the onset potentials for reduction were À1.6, À2.0, À2.1 V (vs. Ag wire).…”

“…Since Jen and coworkers synthesized the first binaphthylbased light-emitting materials in 1999 [5], there have been an increasing interest in synthesis of luminescent materials containing binaphthyl units [6][7][8][9]. It is well known that the dihedral angle between the two naphthalene rings ranges from 601 to 1201 in a binaphthyl unit.…”

Main Chain Chiral-Conjugated Polymers

“…They begin to decompose at much lower temperatures and continuously lose significant amount of mass while heated to 800 • C. Further study on binaphthyl-bithiophene copolymer 2.27 is conducted in collaboration with Jen. 19 The cyclic voltammetry of 2.27 shows two quasi-reversible waves (formal potentials E 1/2ox,I = 0.80 V, E 1/2ox,II = 1.04 V versus Ag/Ag + ) under an anodic sweep, and a single quasi-reversible wave (formal potential E 1/2red,I = ±2.21 V versus Ag/Ag + ) under a cathodic sweep. On the basis of the CV measurement, the energy values for HOMO and LUMO of 2.27 and the HOMO-LUMO gap (E g E C ) are calculated to be ±5.42, ±2.50 and 2.92 eV, respectively.…”

“…19 This device emits orange light when positive voltage is applied to the ITO electrode. The turn-on voltage and rectification ratio are 5.7 V and 4.36 × 10 3 at ±8.0 V, respectively.…”