全文获取类型
收费全文 | 265篇 |
免费 | 2篇 |
国内免费 | 46篇 |
专业分类
化学 | 145篇 |
晶体学 | 6篇 |
物理学 | 162篇 |
出版年
2023年 | 10篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 3篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 6篇 |
2013年 | 9篇 |
2012年 | 8篇 |
2011年 | 27篇 |
2010年 | 17篇 |
2009年 | 12篇 |
2008年 | 23篇 |
2007年 | 27篇 |
2006年 | 27篇 |
2005年 | 18篇 |
2004年 | 18篇 |
2003年 | 14篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 12篇 |
1999年 | 9篇 |
1998年 | 20篇 |
1997年 | 3篇 |
1996年 | 7篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1992年 | 2篇 |
1985年 | 2篇 |
1981年 | 3篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有313条查询结果,搜索用时 921 毫秒
41.
采用高分子络合软模板法利用高分子络合和低温氧化烧结反应,在硅衬底上自组装生长出顶面平滑具有六角柱形结构的ZnO纳米线,并基于此聚丙烯酰胺/ZnO纳米线体系构筑了聚合物基ZnO纳米线发光二极管器件,在相对低的阈值电压下实现了常温常压下电场驱动的蓝色发射光,并且其发光颜色可由其应用的激励电压方便地调控.几乎垂直排列的ZnO纳米线/高分子薄膜在器件中被作为发射层.该方法使用聚合物作为LED器件的粘结剂和发光层的分散介质,稳定了硅衬底上埋置在聚合物薄膜中的ZnO纳米线准阵列并对ZnO纳米晶的表面起钝化作用,防止发光猝灭.结果表明,新技术是一种低成本制备ZnO基紫外/蓝色发光材料的工艺,并且减少了以往工艺中要求ZnO薄膜p型掺杂的麻烦. 相似文献
42.
有机/聚合物电致发光器件(O/PLEDs)具有低能耗、宽视角、色彩丰富、快速响应、绿色环保以及可制备柔性屏等诸多优异特性,被业界公认为是21世纪最具潜质和最具发展前景的高技术领域之一.白光聚合物电致发光器件(WPLEDs)具有可通过湿法加工技术(如旋涂、丝网印刷、喷墨打印)大大降低器件的制作成本等优点,在显示和照明领域有着极大的应用前景,而受到人们广泛的关注.本文就国内在白光聚合物和聚合物白光器件方面的的研究现状,从聚合物白光器件和制备单一白光聚合物两个方面进行阐述,并介绍这一领域的发展前景和目前亟待解决的一些问题. 相似文献
43.
Luminescent group 4 complexes derived from o-carborane, M(η5:η1-CpCMe2CB10H10C)2 (M = Ti; 1, Zr; 2, Hf; 3) and Me2Si(η5-Ind)[η5:η1-Cp-3-(CMe2CB10H10C)]ZrCl (4) were explored. While the Ti complex 1 possessing C2 molecular symmetry shows non-centrosymmetry in the unit cell as identically observed in 2 and 3, the double-ansa Zr complex 4 crystallizes in centrosymmetric P21/n space group despite its C1 molecular symmetry. The non-centrosymmetric crystals of 2 and 3 exhibit blue mechanoluminescence similar to their solution and solid state photoluminescence. In contrast, 1 is lacking mechanoluminescence in crystal and shows much weaker emission than other congeners in solution. The electroluminescence devices based on 2 or 3 doped poly(N-vinylcarbazole) (PVK) as an emitting layer display green electroluminescence, which turned out to be originated from the exciplexes formed between the complex and PVK host. Although the double ansa-Zr complex 4 does not show mechanoluminescence owing to the centrosymmetric nature, it exhibits good electron-transporting properties when incorporated into the electron-transporting layer of Alq3-based OLEDs. 相似文献
44.
A novel bifunctional blue-light material, 9-(pyren-1-yl)-9H-carbazole (CzPy), has been syn-thesized and its structure is identified by electron ionization mass spectrometry, 1H NMR, and element analysis. The absorption, photoluminescence spectra and thermal properties were studied, results showedthat CzPy was stable under ambient conditions with a blue-light emission (461 nm).Additionally, its electroluminescence properties were characterized with four different devices. Results indicated a maximum luminous efficiency reached 1.56 cd/A and maximum luminance up to 3526 cd/m2 at 10 V with commission international De L'Eclairage coordinates of (0.20, 0.24) when it was used as emitter. Furthermore, CzPy also indicated hole-transporting ability. 相似文献
45.
Hirotaka Ogawa Akinori Kan Norihiro Ikeda Akihiro Fujita 《Physica B: Condensed Matter》2012,407(21):4308-4312
The effect of In doping on the electroluminescence (EL) properties of Zn2SiO4:In thin films was investigated. In-doped Zn2SiO4 thin films were deposited on BaTiO3 substrates and their EL properties were characterized in this study. X-ray powder diffraction patterns of In-doped Zn2SiO4 powders revealed a single phase of Zn2SiO4 for In concentrations up to approximately 1.5 mol%, whereas a secondary phase of In2O3 was observed for In concentrations in the range of 2–10 mol%. The maximum luminance of thin film electroluminescent (TFEL) devices varied significantly with the amount of In doping. The highest luminance with blue emission was obtained when 2 mol% In was doped. The blue emission of In-doped Zn2SiO4 thin film may be related to the In substitution for Zn. The 2 mol% In-doped Zn2SiO4 thin film exhibited blue emission with CIE color coordinates of x=0.208 and y=0.086. 相似文献
46.
《Journal of Coordination Chemistry》2012,65(3):453-462
The new heteroleptic iridium(III) complexes (BuOXD)2Ir(tta) and (BuOXD)2Ir(tmd) [BuOXD?=?2-(4-butyloxyphenyl)-5-phenyl[1,3,4]oxadiazolato-N4,C2, tta?=?1,1,1-trifluoro-4-thienylbutane-2,4-dionato, tmd?=?2,2,6,6-tetramethylheptane-3,5-dionato] have been synthesized and characterized. These complexes have two cyclometalated ligands (C^N) and a bidentate diketone ligand (X) [C^N)2Ir(X)], where X is a β-diketone with trifluoromethyl, theonyl or t-butyl groups. The color tuning with the change in electronegativity of substituents in the β-diketones has been studied. Photoluminescence spectra of the complexes showed peak emissions at 523 and 549?nm, respectively. The electroluminescent properties of these complexes have been studied by fabricating multi layer devices with device structure ITO/α-NPD/8% iridium complex doped CBP/BCP/Alq3/LiF/Al. The electroluminescence spectra also showed peak emissions at 526 and 570?nm for (BuOXD)2Ir(tta) and (BuOXD)2Ir(tmd), respectively. These metal complexes showed good thermal stability in air to 340°C. 相似文献
47.
YANG Mu-jie ** NIU Jun-feng HILLER Markus LIU Xu YE Hui FAN Xi-zhi CHEN Jun . Department of Polymer Science Engineering Zhejiang University Hangzhou P. R. China . Department of Optical Engineering Zhej 《高等学校化学研究》2002,18(1):65-69
IntroductionSince the first report,in 1 990 ,of the electro-luminescence of the conjugated polymers in the filmof poly(p- phenylenevinylene) (PPV) sandwichedbetween an anode and a cathode of appropriatework functions[1] ,enormous efforts have been de-voted to the synthesis of light emitting poly-mers[2— 4 ] .Having been found potential applicationof conjugated polymers in photoluminescence(PL)and electro- luminescence (EL ) ,their importantproperties,polymer processability,band gap tun-abil… 相似文献
48.
Jing-ying Zhang Shi-dong Kan Yu-guang Ma Jia-cong Shen Key Lab for Supramolecular Structure Spectroscopy of Ministry of Education Jilin University Changchun China 《高分子科学》2001,(6):591-596
The electroluminescence (EL) produced by a highly luminescent phosphorescent dye Cu_4(C≡CPh)_4L_2 (L = 1.8-bis(di-phenylphosphino)-3, 6-dioxaoctane, Cu_4) doped polymer as emitting layer is reported. The effects o f the chargeinjection balance on the polymers, in particular, poly(N-vinylcarbazole) (PVK) have been studied by usingphotoluminescence and elecholuminescence spectroscopy. Changes in the emission spectra demonstrate the influence of thecharge injection balance on the formation ratio of triplet and singlet excitons. (This provides a new technical approach torealize the color patterning in polymer LEDs. 相似文献
49.
一种新型的稀土Tb配合物的光致和电致发光性能的研究 总被引:1,自引:0,他引:1
用一种新型的含酚羟基的Schiff碱三足配体H3L3稀土Tb配合物作发光层制备了三层结构电致发光器件,器件在正向直流偏压下发出明亮的绿光。器件的电致发光(EL)光谱和Tb配合物薄膜的光致发光(PL)光谱与典型的Tb配合物的发光光谱相同。研究了器件发光及电学特性,讨论了该种新型的稀土Tc配合物的发光机理。 相似文献
50.
两种铽配合物与PVK混合体系的发光机理研究 总被引:4,自引:2,他引:2
研究了稀土配合物Tb(p-MBA)3phen(样品Ⅰ)和Tb(p-ClBA)3phen(样品Ⅱ)与导电聚合物材料PVK掺杂体系的光致发光和电致发光特性。发现在样品Ⅰ与PVK混合薄膜的光致发光中,除了三价铽离子的发光外,还能看到明显的PVK的发光;而在电致发光中,PVK的发光完全被抑制,只能看到Tb3+的绿光发射。对样品Ⅱ与PVK的混合发光层,无论其光致发光谱还是电致发光谱,都没有看到410 nm处PVK的发射。进一步测量两种材料的激发光谱,初步探讨了器件的发光机理。样品Ⅰ的发光可能来源于两个方面,一是PVK到稀土配合物的不完全的能量传递,二是由于载流子俘获机理;样品Ⅱ的发光则是由于PVK到稀土配合物的完全的能量传递。 相似文献