1 兰州理工大学 材料科学与工程学院
2 兰州理工大学 理学院,兰州 730050
通过将Liq（8-hydroxyquinolinato-lithium）掺入电子传输层Alq（tris(8-hydroxyquinolinato)aluminum）中，制备了具有不同结构的仅传输电子的单载流子器件。实验结果表明，掺杂器件的电性能劣于含Liq/Al复合阴极的非掺杂器件，优于含Al阴极的非掺杂器件，这表明掺入Alq的Liq没有产生明显的“n型掺杂”效应，其具有双重作用：掺杂后分散在Alq/Al阴极界面上的Liq以电子注入层的形式出现，通过增强电子注入来提高器件电流；掺杂后存在于Alq体相中的Liq由于自身的导电性差，对电子传输具有不利影响，从而降低了器件的电流。在电致发光器件的测试中，Liq的掺杂表现出类似的现象，掺入Liq的器件性能介于非掺杂具有Liq/Al阴极和Al阴极结构器件之间，三种器件的最大电流效率分别为3.96，4.27和2.27 cd/A，并且在吸收光谱和光致发光光谱中观察不到电荷转移所带来的额外变化。
有机半导体 界面修饰 电荷转移 organic semiconductor Liq Liq Alq Alq interface modification charge transfer
南京邮电大学 电子与光学工程学院、微电子学院, 南京 210023
提出了一种新型电源箝位电路, 旨在解决传统电路中存在的泄漏电流大、误触发、低导通时间等问题。该电路通过引入双极晶体管(BJT), 利用BJT电流放大作用以降低电容容值, 再利用MOS管和串联二极管的反馈作用以调整触发电压, 来提升箝位电路的性能。仿真结果表明, 该电路可以快速响应ESD事件, 并且可以实现快速关断的功能, 从而快速泄放电流, 避免对内部电路造成损坏。
电源箝位电路 误触发 泄漏电流 导通时间 power clamp circuit false trigger leakage current on-time
Author Affiliations
Abstract
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, China
A novel NMOS triggered LIGBT (NTLIGBT) structure is proposed for electrostatic discharge (ESD) protection in this paper. The structure utilizes internal NMOS to trigger SCR-like structure in LIGBT. The trigger voltage is significantly reduced because the embedded NMOS causes N+-drain/P-body junction being apt to avalanche breakdown. At the same time, the new parasitic PNP transistor including the newly added P+-region as a collector forms another path to bleed ESD current and then the conductivity modulation in the LIGBT is weakened. As a result, the holding voltage is increased. So, the proposed NTLIGBT structure has a narrow ESD design window. The simulation results show an improvement of 71.5% in trigger voltage and over 50% in holding voltage comparing with the conventional LIGBT structure.
Journal of Semiconductors
2019, 40(5): 052402
1 兰州理工大学材料科学与工程学院, 甘肃省有色金属新材料省部共建国家重点实验室
2 兰州理工大学理学院, 兰州 730050
以联苯乙烯衍生物(4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl, DPVBi)和红荧烯(5,6,11,12-tetraphenylnaphthacene, Rubrene)分别为蓝色、橙色发射体, 通过超薄插入的方法在DPVBi中插入一层Rubrene制备了结构简单的非掺杂型蓝色、橙色混合有机电致发光器件(OLED)。结果表明, 器件电压对色度的影响规律随插入位置不同而变。当器件发光中以蓝色为主或以橙色为主时器件色坐标随电压的变化较小, 而当器件中蓝色和橙色发射成分较为均衡时色坐标随电压的变化较大。其原因可归于电压对蓝色和橙色发射具有不同的影响。
有机电致发光 联苯乙烯衍生物DPVBi 红荧烯 色度 organic electroluminecence distyrylarylene derivative DPVBi rubrene color chromaticity
Author Affiliations
Abstract
Applicability of the angular properties of scatter elements as a tool to achieve improved slow light performance with small group velocity dispersion and large bandwidth in photonic crystal waveguides is investigated. A polyatomic photonic crystal waveguide, including two scatter elements with different geometrical shapes in each primitive cell, is proposed to investigate the feasibility of our method. Numerical results show that a versatile control of the dispersion relation of slow light modes, with large normalized delay-bandwidth products ranging from 0.2085 to 0.3394, can be obtained using a unique geometrical parameter.
230.5298 Photonic crystals 250.5530 Pulse propagation and temporal solitons 160.5293 Photonic bandgap materials Chinese Optics Letters
2012, 10(12): 122301
1 兰州理工大学1. 材料科学与工程学院 甘肃省有色金属新材料省部共建国家重点实验室
2 兰州理工大学2. 理学院，兰州 730050
以典型蓝色发光材料—联苯乙烯衍生物(4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl, DPVBi)为发光层，采用MoO3为阳极缓冲层制备了结构简单的非掺杂型蓝色有机电致发光器件，得到了低压启动，效率、亮度和色度俱佳的蓝色发光器件。器件启亮电压为3.4V，最高外量子效率为3.2％，最高亮度达到15840cd/m2，器件色坐标为(0.15, 0.15)。高性能器件的获得归因于MoO3缓冲层的插入在阳极/有机层间形成了良好的欧姆接触。
有机电致发光 蓝色 联苯乙烯衍生物DPVBi 发光效率 organic electroluminescence blue distyryl arylene derivative DPVBi luminescent efficiency
