Gold nanoparticle-enhanced amplified spontaneous emission of laser dye molecules in diode-pumped organic solid-state lasers

Abstract

Gold nanoparticles (AuNPs) were introduced to enhance surface-amplified spontaneous emission of laser dye molecules, 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB) doped N,N’-bis-(1-naphthyl)-N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB), taking advantage of localized surface plasmonresonance (LSPR) effect and scattering effect. With emission received from the back surface of the substrate, the optically pumped gain medium with AuNPs, exhibits higher peak intensity, lower threshold, and better Q-factor of when compared with the neat gain medium without AuNPs. Moreover, to realize an organic solid-state laser pumped by electroluminescence emission in an integrated organic light emitting diode (OLED), NPB: DCJTB was embedded as color conversion-hole transport layer (CC-HTL). The AuNPs deposited on the ITO glass substrate of the OLED were also employed to enhance the photoluminescence of the CC-HTL. The maximum luminance, current efficiency and power efficiency improved by 21.55%, 21.90% and 42.11% at 150 mA/cm2 of AuNPs-OLED, respectively, compared to the OLED without AuNPs. These results were attributed to the enhanced hole injection caused by AuNPs as well as LSPR and scattering effects. The introduction of AuNPs provides a simple and promising method to realize diode-pumped organic solid-state lasers.