White-light-emitting devices based on Nile Red and π electron rich [Zn_(4core)] complex

摘要

A white organic light-emitting device was fabricated with a structure of ITO/ PEDOT: PSS (45 nm)/PVK: Nile Red: [Zn_(4core)] (75 nm)/BCP (25 nm)/Al. Without Nile Red green and with Nile Red white emission was achieved. When the concentration of the Nile Red in thin film increased from 0.01 to 0.5 wt%, a white emission achieved. The electroluminescence spectra of the device cover a wide range of visible region with two peaks around 501 and 618 nm. It is noteworthy that a white and pure white OLEDs with an incomplete energy transfer from the green host [Zn_(4core)] to the dopant (Nile Red) was obtained in this work using a single emissive layer relative to the multi layered light emitter ones in white OLED devices. For 0.1 doped device, a maximum luminance efficiency of 2.54 cd/A with CIE coordinates of (x, y = 0.35, 0.37) at 230 mA/cm~2 has was achieved.