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Category: Basic knowledge of solar LED lighting

Luminous flux, luminous efficiency and visual sensitivity of LED optical properties

Luminous flux, luminous efficiency and visual sensitivity of LED optical properties

Posted on October 27, 2021May 14, 2022 by admin

1. Luminous flux Luminous flux Φ is the radiant energy that characterizes the total light output of the LED, and it marks the performance of the device. Φ is the sum of the energy that the LED emits in all directions, and it is directly related to the working current. As the current increases, the…

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Luminescence peak wavelength and spectral distribution of optical properties of LEDs

Luminescence peak wavelength and spectral distribution of optical properties of LEDs

Posted on October 18, 2021May 14, 2022 by admin

The light emitted by the LED is not a single wavelength, and its wavelength is basically distributed as shown in Figure 1. It can be seen from Figure 1 that no matter what material is used for the LED, the spectral distribution curve of the LED has the strongest relative light intensity (the maximum light…

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LED luminous intensity and its angular distribution

LED luminous intensity and its angular distribution

Posted on October 12, 2021May 14, 2022 by admin

The luminous intensity of an LED is a characterization of its luminous intensity in a certain direction. Since the luminous intensity of the LED differs greatly in different spatial angles, it is necessary to study the luminous intensity distribution characteristics of the LED. This parameter is of great practical significance and directly affects the secondary…

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Electrical characteristics of LED

Electrical characteristics of LED

Posted on October 11, 2021October 11, 2021 by admin

1. I-V characteristics. The I-V characteristic is the main parameter that characterizes the performance of the PN junction of the LED chip. The I-V characteristic of the LED has nonlinearity and unidirectional conductivity, that is, the applied positive bias voltage is low resistance, and vice versa, it is high resistance, as shown in Figure 1….

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The luminous efficiency of LED

The luminous efficiency of LED

Posted on October 9, 2021October 9, 2021 by admin

The luminous efficiency of the LED is generally called the external quantum efficiency of the module, which is the product of the internal quantum efficiency of the module and the extraction efficiency of the module. The so-called internal quantum efficiency of a module is actually the electro-optical conversion efficiency of the module itself, which is mainly related to…

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The light-emitting principle of LED

The light-emitting principle of LED

Posted on October 8, 2021October 8, 2021 by admin

LED is made of III-V compounds, such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (gallium arsenide phosphorous) and other semiconductors, and its core is a PN junction. Therefore, it has the I-V characteristics of a general PN junction, that is, forward conduction, reverse cutoff, and breakdown characteristics. In addition, under certain conditions, it also…

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Structural composition and light-emitting process of LED

Structural composition and light-emitting process of LED

Posted on October 8, 2021May 14, 2022 by admin

People have understood the basic knowledge that semiconductor materials can produce light 50 years ago, and the first commercial diode was produced in 1960. The structure of LED is mainly composed of PN junction chip, electrode and optical system. When a forward bias is applied to the electrode, electrons and holes are injected into the…

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Analysis of solar cell characteristics from the application point of view

Analysis of solar cell characteristics from the application point of view

Posted on September 16, 2021May 14, 2022 by admin

The output characteristic curve of the solar cell module is shown as in Figure 1. It can be seen from Figure 1 that the volt-ampere characteristics of solar cells have strong nonlinearity, that is, when the sunlight intensity changes, the open circuit voltage will not change much, but the maximum current generated will change considerably….

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Efficiency and loss of Photoelectric conversion of solar cells

Efficiency and loss of Photoelectric conversion of solar cells

Posted on September 6, 2021May 17, 2022 by admin

Only a small part of the light energy projected on the entire illuminated surface of the solar cell can be turned into electrical energy, because it is affected by many factors. The radiation of sunlight in outer space is basically constant, but after being absorbed by the atmosphere with different composition and thickness (It includes the…

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Introduce the working principle of silicon solar cells from the microscopic level

Introduce the working principle of silicon solar cells from the microscopic level

Posted on August 30, 2021May 14, 2022 by admin

A silicon atom has 14 electrons, which are distributed on three electron layers. The two electron layers inside have been filled, and only the outermost layer lacks four electrons to be half full. In order to achieve a stable structure of the full-electron layer, each silicon atom can only combine with its four adjacent atoms to…

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