摘要
以8-羟基喹啉为配体的金属配合物是一种性能优良的有机电致发光材料,其中有关8-羟基喹啉铝(A lq3)研究已有大量报道,8-羟基喹啉锌(Znq2)研究还有待发展。介绍了两种以Znq2为基体的新型有机电致发光材料Znq2(H2O)2和(Znq2)4的合成方法。用IR、XRD、TG、DTA和荧光测试方法进行表征与分析表明:Znq2(H2O)2和(Znq2)4的玻璃化温度(Tg)分别为104.2℃和204.9℃;在161℃下Znq2(H2O)2脱去水分子成为Znq2,在361℃高温下四聚体(Znq2)4裂解为单体Znq2;Znq2(H2O)2和(Znq2)4具有很好的发光性能,在光致发光谱中λm ax分别是505,550 nm。
Since Tang et al. developed a very high efficient fluorescent material （Alq3） and made the first OELD in 1987, novel organic electroluminescent materials had attracted much interest. Though developed for ten years more, the performances of 8-hydroxyquinoline metal complexes were more excellent than other organic electroluminescent materials in commerce utilizations, such as good light performance, good thermal stability, and good film formability. Alq3 was the best representation, research on performances and applications of Alq3 has matured. But the research on Znq2 was not enough, which limited the commerce utilizations as an excellent organic electroluminescent material. At this point, some foundation research works were done here.
Two Znq2-based organic electroluminescent materials, Znq2 （H2O）2 and （Znq2）4, were prepared and characterized by infrared absorption spectrum （IR）, X-ray diffraction （XRD）, thermogravimetry （TG）, dif- ferential thermal analysis （DTA）, photoluminescence （PL） spectrum and electroluminescence （EL） spectrum.
It was shown that the deviating temperature of H2O from Znq2（ H2O）2 is 161℃, the decomposing temperature of （Znq2）4 into Znq2 is 361℃, the glass transition temperature of Znq2 （H2O） 2 is 104.2 ℃ and that of （ Znq2 ） 4 is 204.9 ℃. In PL spectra, the peak wavelengths of Znq2 （ H2 O） 2 and （ Znq2 ） 4 are 505 nm and 550 nm respectively. In EL spectra, the peak wavelength of （Znq2）4 is 539 nm.
Because of special molecular spatial structure of （ Znq2 ） 4, there is an electron tunnel between adjacent （Znq2） 4 molecules, which could increase electron transition efficiency from HOMO to LUMO and decrease drive voltage of OELD. The high glass transition temperature of （ Znq2 ） 4 could prolong the lifetime of OELD.
Above all, （Znq2）4 have great potential in use as organic electroluminescent material. In addition, Znq2 （H2O）2 has great light intensity and narrow FWHM in PL spectra, and it is also a kind of potential excellent organic electroluminescent material. Application of （Znq2）4 and Znq2 （H2O）2 in OELD will be discussed in detail in future articles.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2006年第2期249-253,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金重点项目(90306014)
国家自然科学基金(20271037)
国家杰出青年科学基金(50025103)
山西省自然科学基金(20011045
20041066)资助项目
