•Determine the junction temperature for LED, driven by DC operating at the room temperature. 3 Theory Since this lab is performed after the laboratory exercise ''The electric prop-erties of LEDs'', the detailed explanation of electrical properties of LEDs is omitted in ''Theory'' and ''Experiment'' sections. , the voltage becomes zero. A V-I characteristic of a photo-voltaic cell is shown in Fig. 1b. The product of open circuit voltage V OC and short circuit current I SC is known a ideal power. Ideal Power = V OC × I SC The maximum useful power is the area of the largest rectangle that can be formed under the V-I curve. If V m and I m phys.uconn.edu The first way is from the length of its leads. The anode lead is longer than the cathode lead of the led. The energy radiated is proportional to the energy gap. The higher the energy gap, the greater the frequency of emitted light. Figure1-1 Light Emitting Diode Band Gap Eg=hf Since Eg=hf /λ a) Carefully bend the leads at a 90° so the device points horizontally 3. Mount the lamp on the breadboard about 1 inch from the transistor a) Depending on the type of lamp supplied, you may have to solder leads onto the lamp or socket before mounting it to the breadboard 4. With the power off, construct the circuit shown on the following slide 24 VIII Determination of Plank‟s constant using LED.26 IX Studying V-I characteristics of LED29 X Determination of radius of curvature of a given plano-convex lens - Newton‟s rings 32 XI Studying V-I characteristics of PIN and Avalanche diode.35 XII Determination of width of a given single slit using diffraction. 38 properties. Figure 1 shows the output characteristics of a laser diode as a function of input current. At low values of the input, the device acts as a light-emitting diode (LED), producing a relatively small amount of incoherent light. At a threshold value, where the population inversion is 10. Plot the P-I characteristics taking If in the x-axis and the Power in watts in the y-axis. 11. By taking the average values of power in watts, VLED and If and using the following formula calculate the conversion efficiency: η = [Po*100/ (VLED* If)] % Result : Thus the VI and PI characteristics of LED was plotted and the Light Emitting diode is a specially designed pn junction diode which operates at positive bias voltage. This video demonstrates the basic procedure to study I - V characteristics of LED. The colour of eight emitted by an LED depends on its band-gap energy Suggest an experiment to verify it and explain the procedure. Medium. View solution > Draw a graph to show current voltage relationship of an ohmic resistor. Medium. View solution > FORMULA USED: Planck's constant is h = eV /ν, where e is an electronic charge, V is voltage reading in voltmeter, v is the frequency of particular LED color. THEORY: The energy of a photon is given by the equation: E = h ν (1) Where E is the energy of a photon, ν is its frequency, and ( h) is Planck's constant. Experiment no.: 5 Lab. Supervisor: Munther N. Thiyab Zener diode characteristics 1 Experiment #5 Object To study and measure the effects of forward and reverse bias on the Zener diode current. To construct a Zener voltage regulator and experimentally determine the range over which the Zener maintains a constant output voltage. FORMULA USED: Planck's constant is h = eV /ν, where e is an electronic charge, V is voltage readi