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构建了基于空气孔型Ga N平板光子晶体(PC)的层状发光二极管(LED)模型。基于平面波展开方法,得到了空气孔型平板光子晶体的能带结构,分析了空气孔半径对禁带宽度的影响,得出最大禁带宽度约为21.5%。设置电偶极子位于Ga N介质层的中心,并在x-y平面内极化,辐射源采用高斯形脉冲,波长取为450 nm,采用三维的时域有限差分法计算LED的出光效率,讨论了平板光子晶体的厚度和空气孔的半径对层状LED的相对出光效率的影响,结果表明:存在最优结构参数值获得最高的相对出光效率,其值约为2。
A layered light-emitting diode (LED) model based on air-hole Ga N flat photonic crystal (PC) was constructed. Based on the plane wave expansion method, the energy band structure of air-hole plate photonic crystals was obtained. The influence of air-hole radius on the forbidden band width was analyzed. The maximum forbidden band width was about 21.5%. The electric dipole is located at the center of the Ga N dielectric layer and is polarized in the xy plane. The radiation source adopts a Gaussian pulse with a wavelength of 450 nm. The three-dimensional finite difference time-domain method is used to calculate the LED output efficiency. The results show that the best relative value of the structure parameters is obtained, which is about 2.