Charge Injection, Transport, Recombination and Generation of Neutral Excitations in Multilayer-Dye Electroluminescent Diodes

Tsutsui, Tetsuo; Lin, Ching Piao; Saito, Shōgo

doi:10.1080/10587259408039232

Cited by 21 publications

(1 citation statement)

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“…The use of an additional hole-blocking/electron-transport layer (HBETL) between the cathode and the organic layer helps not only to block the holes passing on to the cathode but also to inject electrons by tunneling effect, thus increasing the efficiency and stability of such devices. The most widely applied classes of materials are π-electron deficient heterocyclics carrying imine nitrogen atoms in the aromatic ring, such as 1,3,4-oxadiazoles, 1,2,4-triazoles, and 1,4-quinoxalines. − The use of various low molecular weight, oligomeric and polymeric heterocyclics as HBETL in organic light-emitting diodes (LEDs) has also been recently reviewed . The properties such as high thermal and electrochemical stability along with relatively high electronaffinity and high ionization potential allow 1,3,5-triazines to be used as HBETL in electroluminescent devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Application of Dimeric 1,3,5-Triazine Ethers as Hole-Blocking Materials in Electroluminescent Devices

Fink¹,

Heischkel²,

Thelakkat³

et al. 1998

Chem. Mater.

105

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A series of low molecular weight dimeric 1,3,5-triazine ethers with high glass transition temperatures is synthesized from 2-(4-fluorophenyl)-4,6-diphenyl-1,3,5-triazine and various bisphenols. The thermal and electrochemical properties of these materials are examined using differential scanning calorimetry and cyclic voltammetry, respectively. The glass transition temperatures (T g ) are in the range of 106-144°C, and all of them have similar thermal stability and show no weight loss up to 380°C in thermogravimetric measurements. Some of these dimers form stable glasses which do not recrystallize on annealing at or above the T g . Cyclic voltammetry studies reveal that these compounds undergo reversible reduction between -2.09 and -2.27 V vs ferrocene/ferrocenium as internal standard which correspond to LUMO values between -2.5 and -2.7 eV, respectively. The application of one of these dimeric ethers as a hole-blocking/electron-transport material in organic light-emitting devices is demonstrated.

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