实验报告-发光二极管伏安曲线测量(完成版)

姓名学号院系时间地点陈灿贻201411132033数学科学学院2015.11物理楼306黄小君201411131918数学科学学院2015.11物理楼30实验题目】发光二极管的伏安特性【实验记录】1．实验仪器仪器名称直流稳定电源伏特表安培表滑动变阻器电阻箱发光二极管导线开关型号HV1791-35BX70-7112型ZX21型2．红色发光二极管正向伏安特性测量数据记录表电流（mA）电压（V）修正后电压或电流电流（mA）电压（V）修正后电压或电流0.000.060.008.301.917.980.000.300.0010.221.949.900.000.400.0011.421.9511.100.040.750.0012.821.9512.490.121.100.0014.601.9714.270.181.450.0016.601.9816.270.701.750.4114.581.9614.251.801.801.5016.901.9916.572.901.852.5917.601.9917.273.841.853.5318.402.0018.074.861.864.5519.302.0018.976.701.906.3814.501.9614.173．绿色发光二极管正向伏安特性测量数据记录表

电流（mA）电压（V）修正后电压或电流电流（mA）电压（V）修正后电压或电流0.100.600.002.402.881.920.121.020.003.102.902.620.161.150.004.002.933.510.161.330.000.802.750.340.181.500.004.602.954.110.201.700.008.003.037.490.222.080.009.803.059.290.302.210.0012.803.1012.280.402.550.0016.203.1515.670.522.690.0717.703.1617.172.002.851.5219.103.1818.574．蓝色发光二极管正向伏安特性测量数据记录表电流（mA）电压（V）修正后电压或电流电流（mA）电压（V）修正后电压或电流0.000.350.007.202.954.410.000.600.008.602.966.710.181.100.0011.003.008.110.221.600.0014.003.0310.500.302.100.0016.003.0513.490.442.580.0119.003.0515.490.322.200.0011.843.0118.491.002.800.533.302.8911.342.402.881.921.602.832.821.902.851.426.002.951.13

3.602.903.1218.403.055.515．电表内阻测量：R- 5.0Q(30mA) R- 5.985Q(6V)A V【数据处理】在同一坐标系中作出红、绿、蓝发光二极管的伏安特性曲线。对比红、绿、蓝三种发光二极管的伏安特性曲线，定性判断其导通电压的大小。三种发光二极管伏安特性曲线•蓝色发光二极管 •红色发光二极管 •绿色发光二极管烬二25.0020.0015.0010.005.000.000.D0 0.50V/邑压(5.00)烬二25.0020.0015.0010.005.000.000.D0 0.50V/邑压(5.00)由图可知，红色发光二极管的导通电压最小，约为2.00V；蓝色次之，约为3.12V；绿色发光二极管的导通电压最大，约为3.21V。【总结与讨论】通过实验及由发光二极管伏安特性曲线易知，当二极管正向接通时，开始时LED电流随电压变化几乎不可察，发光二极管不发光，但当电压大于某一值时(开启电压后)，电流随电压的变化率呈线性增加而且红色二极管增长最快。【复习思考题】发光二极管有哪些应用？试举一两例并介绍其工作原理。1，各种指示灯，原理是当装置通电后，经过