Abstract
<p indent="0mm">In this study, four different kinds of green light-emitting devices with gold nanoparticles modified anode have been successfully fabricated by vacuum thermal evaporation and spin-coating. The device structure is ITO/Au-NPs/MoO<sub>3</sub>/NPB/Alq<sub>3</sub>/CBP/CsCl/Al. The photoelectric properties, magneto-electroluminescence (MEL) and magneto-conductance(MC) curves of the devices were measured at room temperature. The MEL and MC curves of the device with the CBP film thickness of <sc>15 nm</sc> were measured at ambient temperature ranging from 245 to <sc>9 K.</sc> Experimental results show that the stability of the devices improves after spinning a layer of nano-gold film on the surface of ITO. The value for maximum brightness is <sc>14710 cd/m<sup>2</sup>,</sc> and current efficiency is <sc>4.79 cd/A.</sc> The efficiency roll-off ratio of 5.47% at luminance of <sc>11890 cd/m<sup>2</sup>.</sc> In addition, MC curves completely opposite line type appear at <sc>195 K</sc> compared with room-temperature. The mechanisms show that main reason for improving the stability of device is that the nanoparticles were adsorbed to the anode surface and defects are effectively passivated. Non-lorentz equation was applied to well fit the MC curve at <sc>245 K</sc> under <sc>7 V,</sc> and the fitting result <italic>B</italic><sub>2</sub>=297.37 mT. The reverse intersystem crossing (RISC) process inside device reverses the MC line from positive to negative, triplet excitons break through the barriers to conversion to singlet excitons and increase the utilization rate of triplet excitons. We deeply explore the low-efficiency roll-off devices and micro-mechanisms based on Au-NPs, and provide a feasible idea and researchable method for designing high-stability devices in the future.
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