A novel, blue light-emitting polymer, poly (phenyl-9,9-dioctyl-9',9'dihexanenitrile)fluorene (PPFC6N), containing an alkyl and cyano group in the side chain, was synthesized by Suzuki polymerization and characterized. The polymer structure was confirmed by 1 H-NMR. The number average molecular weight and the weight average molecular weight of the obtained polymer were 9,725 and 9,943 respectively. The resulting polymer was thermally stable with a glass transition temperature (T g ) of 93 o C, and was easily soluble in common organic solvents such as THF, toluene, chlorobenzene and chloroform. The HOMO and LUMO energy levels of the polymer were revealed as 5.8 and 2.88 eV by cyclic voltammetry study, respectively. The ITO/PEDOT:PSS (40 nm)/PPFC6N (80 nm)/LiF (1 nm)/Al (150 nm) device fabricated from the polymer emitted a PL spectrum at 450 nm and showed a real blue emission for pure PPFC6N in the EL spectrum. When t-butyl PBD was introduced as a hole blocking layer, the device performance was largely improved and the EL spectrum was slightly shifted toward deep blue. The device with PPFC6N containing t-butyl PBD layer showed the maximum luminance of 3,200 cd/m 2 at 9.5 V with a turnon voltage of 7 V.

Epidural hematoma after epidural block is a rare complication in healthy patients without risk factor. However, this rare disease can lead to neurological symptoms or paralysis. It is usually treated with surgical drainage. Herein we report a case of acute thoracic epidural hematoma associated with neurologic symptoms after epidural block in a healthy male without risk factors. We performed drainage of the epidural hematoma using 18-gauge Tuohy needle without surgical intervention. The patient's neurological symptoms and pain were relieved. He was discharged without sequelae. CASE REPORTA 73-year-old male patient who visited with intermittent intolerable sharp and lancinating pain over the left anterior chest wall and the back for one month. He received 300 mg/day of gabapentin and 1,500 mg/day of valacyclovir orally for 7 days following diagnosis with acute herpes zoster at a local private clinic. The patient did not have any unusual history, including family history and surgical history. He had no systemic diseases such as hypertension, diabetes, and so on.His height and weight were 172 cm and 59 kg, respectively.Results of his blood tests such as activated partial thromboplastin time, prothrombin time, and platelet count all showed normal ranges.Physical examination revealed allodynia and hyperalgesia over the left T4 and T5 dermatomes. He complained severe pain in the affected area with a score of 8 or 9 on visual analog scale (VAS) where 0 indicated "no pain" and 10 indicated "the strongest pain imaginable." In particular, he was unable to sleep at night due to severe pain which interfered with his daily life.Under the diagnosis of post-herpetic neuralgia, the patient ￭Case Report￭

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