ZnCuInS/ZnS量子点与Poly-TPD补偿发光光谱的研究

ZnCuInS/ZnS量子点是一种无重金属、“绿色”半导体纳米材料。在研究中，制备出尺寸为3.2 nm的ZnCuInS/ZnS核壳量子点，并说明它是施主-受主对复合发光。通过测量ZnCuInS/ZnS量子点的光致发光光谱，其发射峰值波长为620 nm、半宽度是95 nm的红光。同时，还制备出Poly-TPD有机薄膜，其发光光谱是峰值波长为480 nm的蓝光。所以，ZnCuInS/ZnS量子点和Poly-TPD发光颜色具有互补性。在ZnCuInS/ZnS量子点薄膜层上包覆一层poly-TPD薄膜后，二者发光颜色互补。在恰当的偏置电压下，可以得到较好的白光光谱。计算表明，其色坐标是(0.336，0.339)，颜色指数是92。

Investigation of Spectroscopy of ZnCuInS/ZnS Quantum Dots and Poly-TPD

In the present paper ZnCuInS/ZnS core/shell quantum dots were prepared with the particle size of 3.2 nm. Its radiation is based on the donor-acceptor pair transitions, not the band edge emission. According to the measurement of photoluminescence spectrum emitted by ZnCuInS/ZnS core/shell quantum dots, the emitting peak of 620 nm and the full width at half-maximum of 95 nm were achieved as red emitter; meanwhile, organic poly(N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine) (Poly-TPD) film was deposited and used as cyan-emitter with the peak of 480 nm. Two structures of Poly-TPD were analyzed and discussed according to the photoluminescence spectrum. Two wavelengths are complementary color. Therefore, two films were deposited one by one as bilayer emitter to obtain the complementary emission. After the suitable bias was applied on the films, the white emission was achieved with the Commission Internationale de l’Eclairage (CIE) chromaticity coordinates of (0.336, 0.339) and color rendering index of 92. Therefore, the bilayer-structure is a promising candidate for white light emitting diodes fabrication.