厚膜电致发光电视的机遇与挑战

TDEL是薄膜电致发光的变种,继承了TFEL的全部优点,在器件结构的设计、工艺技术和材料技术上进行了大胆的创新和改进,取得了介质材料、发光材料、器件结构和驱动电路等关键技术的突破,解决了亮度、颜色、对比度、寿命和制造工艺等方面存在的问题,使无机固体电致发光进入了数字化平板电视的主战场,因为是无机的、固体的、平板的、自发光的、全彩色并且数字化的,因此可能成为最具竞争力而后来居上的平板电视技术。     

Materials characterization of n - ZnO / p - GaN : Mg / c - Al2O3 UV LEDs grown by pulsed laser deposition and metal–organic chemical vapor deposition

n-ZnO/p-GaN:Mg hybrid heterojunctions grown on c-Al₂O₃ substrates showed 375 nm room temperature electroluminescence. It was suggested that the high materials and interface quality obtained using pulsed laser deposition for the n-ZnO growth and metal–organic chemical vapor deposition for the p-GaN:Mg were key factors enabling the injection of holes and the radiative near band edge recombination in the ZnO. In this paper we present the materials characterization of this structure using x-ray diffraction, scanning electron microscopy and atomic force microscopy.     

浅析全彩色显示屏用LED的搭配选择

对全彩色显示屏用的LED如何搭配进行了探讨，并结合实际对目前常用的几款LED进行了加速老化衰减试验分析。在全彩屏用LED的选择方面提供一些建议与思路。     

LED显示屏检测的抽样方法探讨

提出了LED显示屏技术要求检测中存在的合格判据不明确的问题，探讨了计数调整型抽样方法在LED显示屏检测中的应用，介绍了相关技术条件检测的抽样方法和合格判据。     

SiC和GaN系列蓝色发光二极管的研制

本文简述了Sic和GaN材料的制备过程及以该材料为基础所制造的蓝色发光二极管的制作方法和发光特性。     

New blue electroluminescent n‐type polyfluorene copolymers with a 1,3,4‐oxadiazole unit in the main chain

Novel polyfluorene copolymers alternately having an 1,3,4‐oxadiazole unit in the main chain were prepared by both one‐step and two‐step methods for polyoxadiazole synthesis. They displayed highly efficient blue photoluminescence, the properties of which were affected by the extent of conjugation and the changes in the electron density by a side chain. An electrochemical analysis of the polymers using cyclic voltammetry suggested that they could be used as electron‐transport/hole‐blocking materials as well as blue emission materials for polymer light‐emitting diodes. A simple double‐layer device consisting of poly(N‐vinylcarbazole) as a hole‐transport layer and poly[(9,9′‐didodecylfluorene‐2,7‐diyl)‐alt‐((1,4‐bis(1,3,4‐oxadiazole)‐2,5‐di(2‐ethylhexyloxy)phenylene)‐5,5′‐diyl)] as an emission layer exhibited narrow blue electroluminescence with a maximum at 430 nm. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 1058–1068, 2004     

Novel Ba-Sc-Si-oxide and oxynitride phosphors for white LED

Alkaline earth silicates, which comprise a host material doped with rare-earth minerals, show excellent luminescence properties with various crystal structures and high stability. From results of this study, we report luminescence properties of Ba₉Sc₂Si₆O₂₄:Eu²⁺ and Ba₉Sc_2+δSi₆O_24−3δN_3δ:Eu²⁺ as a novel alkaline earth silicate and silicon oxynitride phosphors for white LEDs. Using a conventional solid-state reaction, Ba₉Sc₂Si₆O₂₄:Eu²⁺ samples were synthesized and Ba₉Sc_2+δSi₆O_24−3δN_3δ:Eu²⁺ samples were obtained by nitrization of Ba₉Sc_2+δSi₆O₂₄:Eu²⁺. The samples can be excited by blue light, exhibiting green (Ba₉Sc₂Si₆O₂₄:Eu²⁺) and yellow (Ba₉Sc_2+δSi₆O_24−3δN_3δ:Eu²⁺) efficiently, which are emissions for use in white LEDs essentially.     

LED驱动器的安全测试中的外壳发热限制试验

文内参考IEC61347-2-13的C7章中所定义的外壳发热限制试验的要求,阐述了试验的背景及过程,仪器的选择,以及实施的办法,并举例说明了实验结果及数据分析。     

Improved electrical and thermal properties of Ag contacts for GaN-based flip-chip light-emitting diodes by using a NiZn alloy capping layer

We investigate the effect of a 100 nm-thick NiZn alloy (10 wt% Zn) capping layer on the thermal and electrical properties of Ag reflectors (200 nm) for flip-chip light-emitting diodes (LEDs). It is shown that the introduction of the NiZn capping layer minimizes the formation of interfacial voids and surface agglomeration. Furthermore, LEDs fabricated with the NiZn-capping-layer-combined contacts produce better output power as compared to those with the Ag only reflectors. For example, the LEDs with the 400 ^°C-annealed Ag/NiZn contacts give higher output power by ∼36% than those with the 400 ^°C-annealed Ag only contacts. X-ray photoemission spectroscopy and Auger electron spectroscopy measurements are performed to understand the improved electrical properties of the LEDs fabricated with the NiZn-capping-layer-combined Ag contacts.     

AC- PDP 的发光光效的数值模拟计算

根据AC—PDP中气体放电机理的物理模型，修改了前人提出的基于粒子流连续性方程和泊松方程的AC—PDP放电单元的数值计算模型。然后由模型的数值解描述了放电过程中三种波长(147nm，152nm，173nm)的紫外光子的时空分布，从而进一步计算出累计的紫外光光效。