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( Yang Jingjie ),박종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The new diazocine derivatives, 2,8-bis(4-(1-(4-(10-(naphthalene-2-yl) anthracen-9-yl)naphthalene-1-yl)-1H -phenanthro[9,10-d]imidazol-2-yl) phenyl)-6H, 12H-5,11-methanodibenzo[b,f ][1,5]diazocine (NANIDZ-I) and (5S,11S)-2,8-bis(4-(1-(4-(10-(naphthalen-1-yl)anthracen-9-yl)naphthalene- 1-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)-6H, 12H-5, 11-methanodibenzo[b,f ][1,5]dizocine (NANIDZ-II) have been successfully synthesized and characterized. It has not only the characteristics of rigid, chiral and C2-symmetry but also charge transport capability and emission. NANIDZ-I and NANIDZ-II were synthesized by changing the substitution position of the imidazole group including various chromophore in the diazocine core. NANIDZ-I device in a non-doped organic light emitting diode resulted in blue emission with luminance efficiency of 4.29 cd/A and CIE of (0.17, 0.25).
( Yang Jingjie ),박종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
We have synthesized green fluorescent emitters of N9,N9,N10,N10- tetraphenylanthracene- 9,10-diamine (TAD) and N9,N9,N10,N10-tetrao- tolylanthracene-9,10-diamine (oMe-TAD) including anthracene and diphenylamine moiety and evaluated properties of compounds. The methyl groups were introduced to the diphenylamine to prevent molecular aggregation of the dopant and reduce self-quenching through steric hindrance of molecular structure. In solution state, photoluminescence (PL) maximum wavelength is 508 nm for TAD and 519 nm for oMe-TAD. In film state, PL maximum wavelength is 518 nm for TAD and 527 nm for oMe-TAD. In electroluminescence (EL) spectra, EL maximum wavelength of TAD is 508 nm and EL maximum wavelength of oMe-TAD is 522 nm. The doped device using TAD as green fluorescent dopant exhibited CE of 17.7 cd/A, PE of 7.74 lm/W, and EQE of 6.11%. The doped device using oMe-TAD as dopant exhibited CE of 19.8 cd/A, PE of 7.23 lm/W, and EQE of 5.97%.
Substituent Effects of Fluoranthene Derivatives in Electroluminescence
( Yang Jingjie ),박종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
7,8,10-triphenylfluoranthene [TPF], 7,10-diphenyl-8-p-tolylfluoranthene [DPTF] and 7,10-diphenyl-8-p-cyanophenlyfluoranthene [DPCF] were synthesized by using the Knoevenagel condensation and Diels-Alder addition. TPF showed skyblue CIE value of (0.192, 0.269) and 3.27cd/A at 10mA/cm2. DPTF also showed sky-blue CIE value of (0.185, 0.252) and 2.31cd/A at 10mA/cm2.
( Yang Jingjie ),박종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Metal chelate complexes are often studied as a carrier transport material in OLEDs, because they have a good electron transport property. We have synthesized metal chelate complexes, Bis(8-hydroxyquinolinato) zinc (Znq2) and Bis(10-hydroxybenzo[h]quinolinato) zinc (Zn (bq)2) as well as Bis(10-hydroxybenzo[h]quinolinato)beryllium Be(bq)2 and compared EL performance with commercialized Alq3. We will report the basic EL performance of synthesized complex materials such as EL spectrum, current efficiency and CIE value. When we applied Znq2 and Zn(bq)2 to conventional blue OLED device, the device exhibited better power efficiency of 0.4 lm=w and 0.28 lm=w compared to 0.2 lm=w of Alq3 device. We also introduce overall EL performance of metal chelate device including Be(bq)2.
( Yang Jingjie ),박종욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
We synthesized new bluish-green and sky-blue emitting materials, 1,1,2,2-tetrakis(40-tert-butylbiphenyl)ethane[TBBPE] and 1,1,2,2-tetrakis (4-(anthracen-9-yl)phenyl)ethene[TAPE]. TBBPE and TAPE film showed PL maximum value of 511nm and 492 nm. TBBPE OLED device showed bluish-green C.I.E. value of (0.236, 0.412) and high luminance efficiency of 5.02 cd=A at 10mA=cm2. TAPE device also showed sky-blue C.I.E. value of (0.213, 0.323) and 3.17 cd=A at 10mA=cm2. It is found that TBBPE shows better luminance efficiency than TAPE and TAPE device exhibits relatively lower operating voltage and better C.I.E. value than TBBPE device.
Synthesis and Optical Properties of Pentacene Derivatives Using Fluorene and Carbazole Moieties
정효철,강석우,( Yang Jingjie ),박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We substituted fluorene and carbazole moieties into pentacene compound for comparing optical and EL properties together. The molecular structure was confirmed by NMR, IR, UV-Visible spectroscopies and FAB-Mass analysis. Flu-PTC-Flu and Cz-PTC-Cz exhibited similar red PL spectrum pattern and their maximum wavelengths appeared at 627 nm and 633 nm. ITO/m-MTDATA/NPB/Alq3:Flu-PTC-Flu (5%)/LiF/Al device showed red EL spectrum at 636 nm with 0.03 cd/A efficiency. ITO/m-MTDATA/NPB/Alq3:Cz-PTC-Cz (5%)/LiF/Al device also exhibited similar red EL spectrum at same range and higher efficiency (> 0.21 cd/A) than Flu-PTC-Flu. We propose the dopant EL property of pentacene derivatives can be changed as the electronic property and steric effect of 6,13-substituted moiety in 6- and 13-positions.
Synthesis and Electroluminescent Properties of Spirofluorene and Carbazole Derivatives for OLEDs
정효철,강석우,( Yang Jingjie ),박종욱 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
We synthesized spirobifluorene and carbazole derivatives such as 5Ph-ECz-5Ph, Fr-ECz-Fr, 5Ph-SF-5Ph, and Fr-SF-Fr, through Diels-Alder reaction. The molecular structure was confirmed by nuclear magnetic resonance (NMR), elemental analysis (EA), UV-Visible, PL spectroscopies. Fr-ECz-Fr exhibited sky blue PL emission at 481nm and 5Ph-SF-5Ph exhibited ultra-violet PL emission at 374nm in CHCl<sub>3</sub> solution, but 5Ph-ECz-5Ph and Fr-SF-Fr showed PL spectra at around 390 and 467, respectively. PL spectra at around 390 and 467, respectively. In nondoped device, 5Ph-ECz-5Ph and Fr-SF-Fr as emitting material showed 1.6 cd/A and 1.7 cd/A, respectively.