Recently, organic light emitting diodes(OLEDs) is widely used as one of the information display techniques. We synthesized 2-(2-hydroxyphenyl)benzoxazole(Zn(HPB)2). We studied the luminescent properties of OLEDs using Zn(HPB)2. The ionization potential(IP) and the electron affinity(EA) of Zn(HPB)2 investigated using cyclic-voltammetry(C-V). The JP, EA and Eg were 6.5eV, 3.0eV and 3.5eV, respectively. The PL and EL spectra of Zn(HPB)2 were observed at the wavelength of 4S0nm. We used Zn(HPB)2 as an emitting layer and hole blocking layer. At the experiment about hole blocking effect, we inserted Zn(HPB)2 between emitting material layer(EML) and cathode, and hole transport layer(HTL) and emitting material layer(EML). We measured current density-voltage and luminance-voltage characteristics at room temperature.