In Situ Solid‐State Generation of (BN)₂‐Pyrenes and Electroluminescent Devices

Abstract

New BN-heterocyclic compounds have been found to undergo double arene photoelimination, forming rare yellow fluorescent BN-pyrenes that contain two BN units. Most significant is the discovery that the double arene elimination can also be driven by excitons generated electrically within electroluminescent (EL) devices, enabling the in situ solid-state conversion of BN-heterocycles to BN-pyrenes and the use of BN-pyrenes as emitters for EL devices. The in situ exciton-driven elimination (EDE) phenomenon has also been observed for other BN-heterocycles.

Donor‐Appended N,C‐Chelate Organoboron Compounds: Influence of Donor Strength on Photochromic Behaviour

“…Despite meeting most of the criteria, such as well‐separated HOMO and LUMO, a small Δ E S−T and a high solid‐state quantum efficiency, 4’ was found to degrade under standard OLED operating conditions (see the Supporting Information) and therefore displayed very poor performance. Given the propensity for such systems to undergo photo‐oxidation or exciton‐driven transformations within OLED devices,, it is entirely possible that the instability of 4’ is due to a similar phenomenon. As a result, N,C‐chelate organoboron compounds bearing an amino group are not suitable for use as emitters in OLEDs.…”

Generation of an N→B Ladder‐type Structure by Regioselective Hydroboration of an Alkenyl‐Functionalized Quaterpyridine

“…Potential n‐type materials have also been generated through intermolecular coordination of strong Lewis acids, such as tris(pentafluorophenyl)borane (B(C 6 F 5 ) 3 ), to conjugated polymers and oligomers . Examples of oligomeric systems that feature intramolecular N→B‐coordination, therefore, give rise to more well‐defined ladder‐type structures, have been investigated by groups of Yamaguchi (Scheme A , B ), Erker ( A ), Wang ( C ), and others . Compound C in particular has also been shown to be a versatile precursor for fully conjugated boron containing heteroacenes …”

Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light‐Emitting Diodes

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] In-depth understanding and innovative engineering of excitons in devices are central topics for the organic semiconductor community. [15,16] However, some excitonic processes in optoelectronic devices www.advopticalmat.de out detailed photophysical and chemical studies on the defects because of the too low quantity. Excitonic processes are also useful for in situ synthesis of organic semiconductors by activating bond dissociation and formation, found to be more efficient than traditional wet chemical synthesis methods.…”