Intense and efficient ultraviolet electroluminescence from organic light-emitting devices with fluorinated copper phthalocyanine as hole injection layer

Abstract

Abstract:We demonstrated intense and efficient ultraviolet (UV) electroluminescence (EL) from organic light-emitting devices using an oxadiazole compound (OXD-7) as an electron transporting UV light-emitting material, whose device structure is indium-tin-oxide/F16CuPc/CBP/OXD-7/LiF/Al. Using the perfluorinated copper phthalocyanine (F16CuPc) as a hole injection material (HIM) and a carbazole derivative (CBP: 4,4'-dicarbazolyl biphenyl) as a hole transporting material with no exciplex formation nature with OXD-7 enhanced the device performances. The turn-on voltage was 10.5 V, the maximum external quantum efficiency reached 0.8% at a current density of approximately 50 mA/cm 2 , and the maximum radiance of EL light reached 10 mW/cm 2 . The fluorinated CuPc is a potential HIM for wide-bandgap organic semiconducting material devices.

Optical and Electrochemical Properties of Non-Peripheral Thioaryl-Substituted Subphthalocyanine as Precursors for Dye-Sensitizer to Develop Photovoltaic Cells

“…After the reaction, the mixture was allowed to warm slowly to room temperature; stirring was continued for 24 h. The mixture was poured into water (600 cm 3 ). Then the organic layer was extracted using dichloromethane (5 × 100 cm 3 ). The extract was washed in turn with water, 2%-hydrochloric acid, water, brine and water, and dried on magnesium sulfate (MgSO 4 ).…”

“…The reaction products were poured into water (300 cm 3 ), and the organic layer extracted using dichloromethane (5 × 100 cm …”

“…The strongest absorption of phthalocyanines in the visible region called the Q band can be moved by red shift through introduction of an electron-donating substituent at a peripheral (2,3,9,10,16,17,23,24) position [18]. Then, the non-peripheral (1,4,8,11,15,18,22,25) substituted phthalocyanines can show a bathochromic effect in comparison with the peripheral position [4] [19].…”

Synthesis of alkylthio substituted pyridoporphyrazines and their photophysicochemical properties

“…Phthalocyanines and their related compounds are particularly known to have potential as photosensitizers of photodynamic therapy of cancer (PDT) [2,[4][5][6][7][8]. Phthalocyanines and their related compounds used for PDT are required to have long life-time triplet states and show strong absorption of far red light between 600 and 800 nm, values of wavelengths which have a greater penetration of tissue and satisfactory photosensitization of singlet oxygen [2].…”

“…We report herein synthesis of zinc bis(1,4-didecylthiobenzo)-bis(3,4-pyrido)porphyrazine (5) and zinc bis-(1,4-didecylthiolbenzo)-bis(2,3-pyrido)porphyrazine (6). We also report their photophysicochemical properties obtained from photoexcited triplet lifetimes using laserflash photolysis and singlet oxygen quantum yields by the 1,3-diphenylisobezofurane (DPBF) method.…”