Two interlayers, blended interlayer based on TPD- oxetane with PFO- TPD-OCH3 and crosslinkable polymer interlayer based on Poly( RO2- spiro- TPAoxetane), were introduced in polymer light- emitting diodes ( PLEDs). Both interlayers showed resistance to organic solvents and the performance of PLEDs was greatly enhanced when each interlayer was inserted. The maximumluminescence efficiency of 0.147 cd/A at 11V and the maximum luminescence of 739 cd/ m(2) at 15V have been achieved with blue light emitting polymer, Poly( RO2- spirobifluorene).