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半导体/介质纳米颗粒镶嵌材料中光致载流子弛豫过程的研究进展 被引量:1
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作者 丁瑞钦 杨恢东 +1 位作者 王浩 周国荣 《半导体技术》 CAS CSCD 北大核心 2000年第2期1-6,共6页
从全光通信对光子器件的要求出发 ,报道了近年来在半导体 /介质纳米颗粒镶嵌材料中光致载流子弛豫过程的研究进展。强量子限制效应可以大大地减小激子的寿命 ,但这种材料 ( - 族例外 )普遍存在着长寿命的俘获态 。
关键词 半导体纳米颗粒 光致载流子 驰豫过程 通信
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GaAs中对撞光致载流子光栅引起的能量转移和脉冲形变
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作者 张筑虹 范滇元 邓锡铭 《量子电子学报》 CAS CSCD 1992年第1期75-76,共2页
GaAs中光致载流子光栅引起的瞬态能量转移是光放大,光开关等研究的基础,Smirt等人对光栅沿平行GaAs表面方向形成的情况进行了广泛而深刻的理论和实验研究,并认为两强度相同的脉冲间不存在能量转移。本文研究了光栅沿通光方向形成的光对... GaAs中光致载流子光栅引起的瞬态能量转移是光放大,光开关等研究的基础,Smirt等人对光栅沿平行GaAs表面方向形成的情况进行了广泛而深刻的理论和实验研究,并认为两强度相同的脉冲间不存在能量转移。本文研究了光栅沿通光方向形成的光对撞光致光栅引起的能量转移和由此以及光自衍射引起的脉冲形变,给出了光栅自衍射的普适公式,理论计算了这些过程,得到了相同强度光脉冲间的能量转移,获得了与预计一致的脉冲形变。 展开更多
关键词 瞬态能量转移 光致载流子 脉冲形 栅衍射 GAAS 中国科学院 对撞 精密机械 自衍射 放大
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Measurements of Carrier Confinement at β-FeSi_2-Si Heterojunction by Electroluminescence
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作者 李成 末益崇 长谷川文夫 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第2期230-233,共4页
A Si p-π-n diode with β-FeSi 2 particles embedded in the unintentionally doped Si (p--type) was designed for determining the band offset at β-FeSi 2-Si heterojunction.When the diode is under forward bias,the elec... A Si p-π-n diode with β-FeSi 2 particles embedded in the unintentionally doped Si (p--type) was designed for determining the band offset at β-FeSi 2-Si heterojunction.When the diode is under forward bias,the electrons injected via the Si n-p- junction diffuse to and are confined in the β-FeSi 2 particles due to the band offset.The storage charge at the β-FeSi 2-Si heterojunction inversely hamper the further diffusion of electrons,giving rise to the localization of electrons in the p--Si near the Si junction,which prevents them from nonradiative recombination channels.This results in electroluminescence (EL) intensity from both Si and β-FeSi 2 quenching slowly up to room temperature.The temperature dependent ratio of EL intensity of β-FeSi 2 to Si indicates the loss of electron confinement following thermal excitation model.The conduction band offset between Si and β-FeSi 2 is determined to be about 0 2eV. 展开更多
关键词 β-FeSi2-Si heterojunction ELECTROLUMINESCENCE band offset carrier confinement
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Exceptionally efficient deep blue anthracene-based luminogens:design,synthesis,photophysical,and electroluminescent mechanisms 被引量:1
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作者 Runda Guo Wei Liu +8 位作者 Shian Ying Yuwei Xu Yating Wen Yaxiong Wang Dehua Hu Xianfeng Qiao Bing Yang Dongge Ma Lei Wang 《Science Bulletin》 SCIE EI CSCD 2021年第20期2090-2098,M0004,共10页
Achieving high-efficiency deep blue emitter with CIE_(y)<0.06(CIE,Commission Internationale de L’Eclairage)and external quantum efficiency(EQE)>10%has been a long-standing challenge for traditional fluorescent ... Achieving high-efficiency deep blue emitter with CIE_(y)<0.06(CIE,Commission Internationale de L’Eclairage)and external quantum efficiency(EQE)>10%has been a long-standing challenge for traditional fluorescent materials in organic light-emitting diodes(OLEDs).Here,we report the rational design and synthesis of two new deep blue luminogens:4-(10-(4’-(9 H-carbazol-9-yl)-2,5-dimethyl-[1,1’-biphe nyl]-4-yl)anthracen-9-yl)benzonitrile(2 M-ph-pCzAnBzt)and 4-(10-(4-(9 H-carbazol-9-yl)-2,5-dimethyl phenyl)anthracen-9-yl)benzonitrile(2 M-pCzAnBzt).In particular,2 M-ph-pCzAnBzt produces saturated deep blue emissions in a non-doped electroluminescent device with an exceptionally high EQE of 10.44% and CIE_(x,y)(0.151,0.057).The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion,which are supported by analysis of theoretical calculation,triplet sensitization experiments,as well as nanosecond transient absorption spectroscopy.This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters. 展开更多
关键词 Anthracene derivative Deep blue luminogen Hot excitons Triplet-triplet annihilation up-conversion Non-doped device
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All-vacuum fabrication of yellow perovskite light-emitting diodes 被引量:3
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作者 Jinghui Li Longbo Yang +7 位作者 Qingxun Guo Peipei Du Liang Wang Xue Zhao Nian Liu Xuke Yang Jiajun Luo Jiang Tang 《Science Bulletin》 SCIE EI CSCD 2022年第2期178-185,M0004,共9页
Yellow light-emitting diodes(LEDs) are widely utilized in high-quality lighting, light communication,indicator lamps, etc. Owing to their outstanding material properties and device performance, the metal halide perovs... Yellow light-emitting diodes(LEDs) are widely utilized in high-quality lighting, light communication,indicator lamps, etc. Owing to their outstanding material properties and device performance, the metal halide perovskites have demonstrated a significant potential for LED applications. However, the performance of the yellow perovskite LEDs(PeLEDs) is inferior to that of their green and red counterparts, with the maximum external quantum efficiency(EQE) limited to ~3.1%. Further, a majority of the yellow PeLEDs are fabricated using the spin-coating methods. The current study reports the development of the yellow CsPbBr_(2)I PeLEDs based on an all-vacuum deposition approach, which has been widely employed in the commercial organic LEDs(OLEDs). By controlling the co-evaporation rate of CsI and PbBr;, the growth kinetics of the perovskite layer are regulated to achieve a small grain size of~31.8 nm. Consequently, an improved radiative recombination rate(8.04 × 10^(-9)cm^(3)/s) is obtained owing to the spatial confinement effect. The PeLEDs based on the optimal perovskite film demonstrate the yellow electroluminescence(574 nm) with a maximum EQE of ~3.7% and luminance of~16,200 cd/m^(2), thus, representing one of the most efficient and bright yellow PeLEDs. Overall, this study provides a useful guideline for realizing the efficient PeLEDs based on the thermal evaporation strategy and highlights the potential of PeLED as an efficient and bright yellow light source. 展开更多
关键词 All-vacuum fabrication INORGANIC CsPbBr2I Yellow light-emitting diodes
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Light-emitting field-effect transistors with EQE over 20%enabled by a dielectric-quantum dots-dielectric sandwich structure 被引量:1
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作者 Lingmei Kong Jialong Wu +12 位作者 Yunguo Li Fan Cao Feijiu Wang Qianqian Wu Piaoyang Shen Chengxi Zhang Yun Luo Lin Wang Lyudmila Turyanska Xingwei Ding Jianhua Zhang Yongbiao Zhao Xuyong Yang 《Science Bulletin》 SCIE EI CSCD 2022年第5期529-536,M0004,共9页
Emerging quantum dots(QDs)based light-emitting field-effect transistors(QLEFETs)could generate light emission with high color purity and provide facile route to tune optoelectronic properties at a low fabrication cost... Emerging quantum dots(QDs)based light-emitting field-effect transistors(QLEFETs)could generate light emission with high color purity and provide facile route to tune optoelectronic properties at a low fabrication cost.Considerable efforts have been devoted to designing device structure and to understanding the underlying physics,yet the overall performance of QLEFETs remains low due to the charge/exciton loss at the interface and the large band offset of a QD layer with respect to the adjacent carrier transport layers.Here,we report highly efficient QLEFETs with an external quantum efficiency(EQE)of over 20%by employing a dielectric-QDs-dielectric(DQD)sandwich structure.Such DQD structure is used to control the carrier behavior by modulating energy band alignment,thus shifting the exciton recombination zone into the emissive layer.Also,enhanced radiative recombination is achieved by preventing the exciton loss due to presence of surface traps and the luminescence quenching induced by interfacial charge transfer.The DQD sandwiched design presents a new concept to improve the electroluminescence performance of QLEFETs,which can be transferred to other material systems and hence can facilitate exploitation of QDs in a new type of optoelectronic devices. 展开更多
关键词 Light-emitting field-effect transistors Quantum dots ELECTROLUMINESCENCE External quantum efficiency
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