MoOx를 사용한 청색 형광 Tandem OLED의 발광 특성
Emission Characteristics of Blue Fluorescence Tandem OLED Using MoOx
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초록
To improve emission efficiency of organic light emitting devices (OLEDs), we fabricated the tandem OLEDof ITO / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al / MoOx (X nm) / 2-TNATA / NPB /SH-1: 3 vol.% BD-2 / Bphen / Liq / Al structure. And emission properties of single OLED and tandemOLED with MoOx thickness as charge generation layer (CGL) were measured. The current emission efficiencyand quantum efficiency of tandem OLED with MoOx of 3 nm thickness were improved compare with singleOLED from 7.46 cd/A and 5.39% to 22.57 cd/A and 11.76%, respectively. In case of thicker or thinnerthan MoOx of 3~5 nm, the current emission efficiency and quantum efficiency were decreased, because balanceof electron and hole in emission layer was not matching. The driving voltage was increased from 8 V ofsingle OLED to 15 V of tandem OLED by thickness increase of OLED. As a result, it was possible toimprove the emission efficiency of OLEDs by optimized MoOx thickness.
Abstract
To improve emission efficiency of organic light emitting devices (OLEDs), we fabricated the tandem OLEDof ITO / 2-TNATA / NPB / SH-1: 3 vol.% BD-2 / Bphen / Liq / Al / MoOx (X nm) / 2-TNATA / NPB /SH-1: 3 vol.% BD-2 / Bphen / Liq / Al structure. And emission properties of single OLED and tandemOLED with MoOx thickness as charge generation layer (CGL) were measured. The current emission efficiencyand quantum efficiency of tandem OLED with MoOx of 3 nm thickness were improved compare with singleOLED from 7.46 cd/A and 5.39% to 22.57 cd/A and 11.76%, respectively. In case of thicker or thinnerthan MoOx of 3~5 nm, the current emission efficiency and quantum efficiency were decreased, because balanceof electron and hole in emission layer was not matching. The driving voltage was increased from 8 V ofsingle OLED to 15 V of tandem OLED by thickness increase of OLED. As a result, it was possible toimprove the emission efficiency of OLEDs by optimized MoOx thickness.
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