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Synthesis and blue electroluminescent properties of zinc (II) [2-(2-hydroxyphenyl)benzoxazole]
Authors:Won Sam Kim  Burm-Jong Lee  Yoon-Ki Jang  Young-Soo Kwon
Affiliation:a Department of Chemistry and BPRC, Inje University, Gimhae 621-749, Republic of Korea
b Department of Electrical Engineering, Dong-A University, Busan 604-714, Republic of Korea
Abstract:This study reports on the properties of organic light-emitting diodes (OLEDs) with zinc (II) [2-(2-hydroxyphenyl)benzoxazole] as a hole-blocking layer. OLEDs devices are prepared in a conventional OLEDs structure (i.e., anode/HTL/EL/HBL/cathode and anode/HTL/HBL/EL/cathode). The luminescence efficiencies and the turn-on voltage are significantly affected by the existence of the hole-blocking layer. This is attributed to an excellent hole-blocking property, which is in turn due to the high HOMO energy level (6.5 eV). The device showed luminous efficiency 2.46 lm/W at 5 V. The maximum luminance of about 10,000 cd/m2 is obtained, and the turn-on voltage (2.5 V) is affected by the existence of the hole-blocking layer.
Keywords:2-(2-Hydroxyphenyl)benzoxazole   Electroluminescence   Hole-blocking layer
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