黄绿光发光二极管光衰性能研究

AlGaInP是GaAs基LED有源区主要材料,广泛应用于黄绿光至红光波段的LED。但在短波段尤其是黄绿光波段（565～575 nm）,因其材料组成较接近间接带隙,其发光效率和稳定性存在问题。目前黄绿光功率衰减以俄歇复合损耗、非复合辐射中心损耗、载流子损耗为主。所以研究相同生长温度不同阱垒厚度、量子阱相同厚度不同生长温度、P型掺杂层掺杂浓度对发光光衰的影响。发现较薄的MQW阱垒厚度、较高的MQW生长温度及P-space后端P型层前端插入一层20 nm厚度,1.7×1018 cm-3浓度的高掺杂层三种方案可以改善黄绿光发光二极管光衰性能。天津市科技支撑、新材料重大专项项目(17YFZCGX00330,18ZXCLGX00080

[Bmim][PF_6]高效吸收二氯甲烷及流程模拟

采用智能重量吸附仪测量了不同温度、压力下二氯甲烷(CH_2Cl_2)在离子液体1-丁基-3-甲基咪唑六氟磷酸盐([Bmim][PF_6])中的溶解度,用NRTL方程建立了离子液体-二氯甲烷体系的气液平衡模型,拟合得到二元交互作用参数,计算所得的二氯甲烷溶解度与实验数据吻合良好,平均相对误差为3.16%.构建了离子液体处理含二氯甲烷尾气及资源回收利用的常压吸收-减压闪蒸解吸工艺和模型,模型适用范围为温度278.15~308.15 K,压力0~0.1 MPa.对吸收塔进行了模拟和灵敏度分析,获得了常温常压吸收条件下的最佳操作工艺参数.</p

P-AlInP限制层掺杂对AlGaInP红光LED发光亮度影响

针对四元系AlGaInP红光发光二极管在制备过程中,材料的掺杂特性对于器件性能影响巨大,尤其是AlInP限制层材料的掺杂,对于器件光电性能具有明显的影响。在实际生产过程中P型掺杂浓度的波动非...天津市科技支撑、新材料重大专项项目(17YFZCGX00330,18ZXCLGX00080

bmimpf6高效吸收二氯甲烷及流程模拟

采用智能重量吸附仪测量了不同温度、压力下二氯甲烷(CH_2Cl_2)在离子液体1-丁基-3-甲基咪唑六氟磷酸盐(BmimPF_6)中的溶解度,用NRTL方程建立了离子液体-二氯甲烷体系的气液平衡模型,拟合得到二元交互作用参数,计算所得的二氯甲烷溶解度与实验数据吻合良好,平均相对误差为3.16%.构建了离子液体处理含二氯甲烷尾气及资源回收利用的常压吸收-减压闪蒸解吸工艺和模型,模型适用范围为温度278.15~308.15 K,压力0~0.1 MPa.对吸收塔进行了模拟和灵敏度分析,获得了常温常压吸收条件下的最佳操作工艺参数

In0.53Ga0.47As/InP高速光电二极管材料生长及光电性能

利用低压MOCVD技术制备PIN结构的InP基InGaAs外延材料。采用分层吸收渐变电荷倍增（SAGCM）结构,通过两次Zn扩散、多层介质膜淀积、Au/Zn p型欧姆接触、Au/Ge/Ni n型欧姆接触等标准半导体平面工艺,设...天津市科技支撑、新材料重大专项项目(17YFZCGX00330,18ZXCLGX00080

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^