The influence of the working temperature on the Current Balance Factor(CBF) value of the single layer Organic Light Emitting Diodes(OLEDs) was investigated by utilizing a numerical model of a bipolar single layer OLED with organic layer level traps.Results show that the largest CBF value can be achieved when the electron injection barrier (n) is equal to the hole injection barrier (p) in the lower working temperature region at any instance.In the higher working temperature region,the largest CBF can be achieved in the case of n >p under the condition of electron mobility (μ0n) larger than hole mobility (μ0p),whereas the result for the case of μ0n<μ0p,is the opposite.When μ0n=μ0p,the largest CBF can be achieved in the case of n=p in the entire region of the working temperature.In addition,the CBF value of the device increases as working temperature increasing.The results obtained in this paper can present an in-depth understanding of the OLEDs working mechanism.