Synthesis and Electroluminescence of New Organic Emitters Based on a π-Conjugated 1,3,5-Triazine Core

Abstract

The photoluminescence and electron drift mobility of newly synthesized 1,3,5-triazine derivatives were investigated. 1,3,5-Triazine derivatives with one or two 4-(arylethynyl)phenyl groups had single photoluminescence peaks in the blue region, 405-452 nm, in the deposited films. Time-of-flight measurement revealed that electron transport in the films of certain 1,3,5-triazine derivatives was non-dispersive and electron drift mobilities were in the range of 10 -5 -10 -4 cm 2 V -1 s -1 . OLED devices incorporating 1,3,5-triazine derivatives in the emitting layer had pure blue luminescence at 437 nm and 444 nm. Moreover, these compounds were also able to be used as an electron-transport layer.

A DFT probe on the linear and nonlinear optical characteristics of some star‐shaped DI‐π‐DII‐Atype acetylene‐bridged rigid triazines

“…The molecule TZ3, which is designed by replacing the t ‐butyl group of previously known 2,4,6‐tris[4‐(4‐ tert ‐butylphenylethynyl)phenyl]‐1,3,5‐triazine with a methyl group, showed λ cal of 336 nm, which agreed very well with λ exp of 337 nm of original molecule. Similarly, the molecules TZ4 and TZ7, which are designed by replacing the long alkyl chains in original molecules by simple methyl group, showed λ cal of 343 and 320 nm respectively, which are comparable with their λ exp of 361 and 343 nm, respectively.…”

“…The molecules in this work are equipped with electron‐donating groups (as in TZ2, TZ3, TZ4, TZ5, TZ6, TZ7, and TZ8) and electron‐withdrawing groups (as in TZ9), while considering unsubstituted TZ1 as parent molecule. The molecules included in this study, ie, TZ1, TZ3, TZ4, TZ5, TZ6, TZ7, and TZ8, are known experimentally, but their potential NLO nature was not paid attention except the parent molecule TZ1. The current computational study contributes to discover the optical nonlinearity of all the molecules under investigation along with studies of their electronic excitations.…”

Substituted 5,6,11,12-Tetradehydrodibenzo[a,e]cyclooctenes: Syntheses, Properties, and DFT Studies of Substituted Sondheimer–Wong Diynes

“…Aryl alkynes have attracted great attention because they have rigid arrays bearing expanded π systems and thus can serve as organic optoelectronic materials such as dyes for photoelectron conversion devices, light-emitting materials for electroluminescence (EL), and organic semiconductor materials . Aryl alkynes undergo a variety of transformations in organic synthesis to give newly formed expanded π systems.…”

Electronic Absorption, Emission, and Two-Photon Absorption Properties of Some Extended 2,4,6-Triphenyl-1,3,5-Triazines

“…The desired 3-X, 4, and 7-X derivatives are structurally close to known s-triazine derivatives [15][16][17]27,[34][35][36][37][38][39][40]. The 3-X series corresponds to the simplest derivatives in which the 1,3,5-triphenyl-s-triazine core has been extended with a phenyl-alkynyl linker and terminated with X-groups of varying electron-donor/acceptor power.…”