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신환규,이재현,이선미,강현미,이하윤,강석우,김범진,박종욱 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
This study substituted diphenyl amine(DPA) and triphenyl amine(TPA), which are different in size, with side groups and systematically changed their position in a dual core composed of anthracene and pyrene to synthesize blue emitting materials with asymmetric or symmetric structures. The study synthesizes DPA-AP-TP, TPA-AP-TP, TP-AP-DPA and TP-AP-TPA, as the structures asymmetric with 1-Anthracen-9-ylpyrene (AP-core), a dual core, and DPA-AP-DPA and TPA-AP-TPA as those symmetric with AP-core. Among synthesized compounds, TPA-AP-TP which TPA side group was substituted in anthracene showed the highest EL device efficiency as 8.05 cd/A and exhibited sky blue emission of CIE (0.14, 0.24).
신환규,강현미,정효철,양가람,이수지,박종욱 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Four new emitting compounds of 5P-VTPA, 5P-VCB, 5P-VAn and 5P-VPy for OLED based on hexaphenyl benzene moiety were synthesized. Physical properties by the change of the substitution groups of the synthesized materials were systematically examined. Photoluminescence (PL) spectrum of the synthesized materials showed maximum emitting wavelengths of about 437~488 nm in solution state and 457~516 nm in film state, indicating blue emission color. OLED devices were fabricated by the synthesized compounds using vacuum deposition process as an emitting layer. Device structure was ITO/2-TNATA 60nm/ NPB 15nm/ EML 35nm/ TPBi 20nm/ LiF 1nm/ Al 200nm. Current efficiencies and CIE values of 5P-VTPA, 5P-VCB, 5P-VAn and 5P-VPy were 1.30, 1.76, 0.38 and 7.91 cd/A and (0.15, 0.07), (0.15, 0.07) and (0.20, 0.31) and (0.20, 0.36), respectively.
신환규,박종욱,강석우,정효철 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Highly efficient blue emitting materials consisting of dual core derivatives with triphenylamine side groups and symmetric structures were designed and synthesized. Of the synthesized compounds, mTPA-APmTPA was found to exhibit the highest EL device efficiency of 4.19 cd A-1 and 4.49% EQE. OLED devices were fabricated by the synthesized compounds using vacuum deposit process as an emitting layer. Device structure was ITO/2-TNATA 60 nm/ NPB 15 nm/ EML 35nm/ TPBi 20 nm/ LiF 1 nm/ Al 200 nm. mTPA-AP-mTPA and TPA-AP-TPA exhibit EL maximum values of real blue color in the range 455 nm to 463 nm. The y values of their color coordinates are within the range 0.150 to 0.260, so these compounds exhibit good blue color coordinates for displays.
신환규,박종욱,이재현,류재민 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Four blue emitting compounds of 5P-2TP, 5P-2A, 5P-2P and 5P-2C for OLED based on hexaphenyl benzene moiety were demonstrated. Physical properties by the change of the substitution groups of the synthesized materials were systematically examined. Photoluminescence (PL) spectrum of the synthesized materials showed maximum emitting wavelengths of about 434~488 nm in solution state and 483~516 nm in film state, indicating blue emission color. OLED devices were fabricated by the synthesized compounds using vacuum deposit process as an emitting layer. Device structure was ITO/2-TNATA 60nm/ NPB 15nm/EML 35nm/ TPBi 20nm/ LiF 1nm/ Al 200nm. Current efficiencies and CIE values of 5P-2TP, 5P-2A, 5P-2P and 5P-2C were 1.30, 1.76, 2.84 and 4.89 cd/A and (0.150, 0.076), (0.150, 0.073), (0.236, 0.458) and (0.240, 0.450) respectively.
Position effect based on pyrene core for fluorescence emitting materials
신환규,박종욱,강현미,이하윤 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Green-orange emitters based on pyrene core have successfully been synthesized by substitution with triphenylamine side group in the 1,6 or 2,7 positions. There are larger blue shifts in the UV-visible absorption and PL spectra of the synthesized 2,7-substituted derivative compared to 1,6-substituted derivative. When the synthesized compounds were used as emitting layers in non-doped OLED devices, a related trend was observed in their optical properties. OLED devices were fabricated by the synthesized compounds using vacuum deposit process as an emitting layer. Device structure was ITO/2-TNATA 60 nm/ NPB 15 nm/ EML 35 nm/ Alq3 20 nm/ LiF 1nm/ Al 200 nm. CIE values of 1,6-Py and 2,7-Py were (0.43, 0.54) and (0.17, 0.36).
Electroluminescence properties of highly efficient dual core chromophores for blue emission
신환규,박종욱,조민진,김승호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Highly efficient blue emitting materials consisting of dual core derivatives with triphenylamine side groups and symmetric structures were designed and synthesized. Of the synthesized compounds, DPA-AP-DPA was found to exhibit the highest EL device efficiency of 4.19 cd A-1 and 4.49% EQE. OLED devices were fabricated by the synthesized compounds using vacuum deposit process as an emitting layer. Device structure was ITO/2-TNATA 60nm/ NPB 15nm/ EML 35nm/ TPBi 20nm/ LiF 1nm/Al 200nm. mTPA-AP-mTPA and TPA-AP- TPA exhibit EL maximum values of real blue color in the range 455 nm to 463 nm. The y values of their color coordinates are within the range 0.150 to 0.260, so these compounds exhibit good blue color coordinates for displays.