Red EL Properties of OLED Having Hole Blocking Layer

概要

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In this study, we prepared red organic light-emitting-diode (OLED) with a fluorescent dye(Sq)-doped and inserted1, 3-bis (5-p-t-butylphenyl)-1, 3, 4-oxadiazol-2-yl) benzene (OXD7) or / and tris (8-hydroxyquinoline) aluminum (Alq3) layers between emission layer and cathode in order to increase electroluminescent (EL) efficiency. This inserting effect has been observed and EL mechanism characteristics have been examined. The hole transport layer was N, N'-diphenyl-N, N'bis-(3-methylphenyl)-1, 1'diphenyl-4, 4'-diamine (TPD); the host material of emission layer was Alq3; the guest material of emission layer was Sq. When Alq3 was inserted between the emission layer and the cathode, emission efficiency increased. Highly pure red emission, however, was not attaina ble with Alq3. On the other hand, the insertion of OXD7 between the two layers blocked and accumulated holes. Because of its increasing recombination probability of electron and hole, luminance characteristics and emission efficiency were improved with holding highly pure red color.
社団法人電子情報通信学会の論文
2000-07-25