Zhang Yu, Liu Wen-Yan, Zhang Tie-Qiang, Wang Ya-Nan, Gu Peng-Fei, Wang Peng, Wang Yi-Ding, Wang Fang-Rong
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2012 Jul;32(7):1943-5.
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 donoracceptor 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.
在本论文中，制备了粒径为3.2 nm的ZnCuInS/ZnS核壳量子点。其发光基于施主-受主对跃迁，而非带边发射。根据对ZnCuInS/ZnS核壳量子点发射的光致发光光谱的测量，作为红色发光体实现了620 nm的发射峰和95 nm的半高宽；同时，沉积了有机聚（N，N'-双（4-丁基苯基）-N，N'-双（苯基）联苯胺）（聚-TPD）薄膜，并用作峰值为480 nm的青色发光体。根据光致发光光谱对聚-TPD的两种结构进行了分析和讨论。两种波长为互补色。因此，将两层薄膜依次沉积作为双层发光体以获得互补发射。在薄膜上施加合适的偏压后，实现了白光发射，其国际照明委员会（CIE）色度坐标为（0.336，0.339），显色指数为92。因此，双层结构是用于制造白光发光二极管的有前途的候选结构。
