Abstract
The research object of this work is the parameters of organic light-emitting diodes, namely power and luminous flux. Determination of these parameters can be carried out using a photodiode and requires measuring the dark current of the sensor (photodiode), measuring the current of the photodiode when illuminated by the LED under investigation. And also take into account the relationship between the light flux received by the sensor and its output current, and take into account the spectral characteristics of the sensor. Calculate the investigated parameters of the LED based on the measurements. Carrying out these measurements requires laboratory instruments and workplace organization, and further calculations are routine work. It is possible to increase the measurement accuracy by improving the existing methods for measuring the required parameters, and it is possible to automate the process of measurements and calculations using a modern microprocessor radioelement base. Microcontrollers are widespread such radioelements. They have the necessary peripherals for independent operation and have sufficient computing power to implement the required measuring device. Its application makes it possible to automate the measurement process, carry out the necessary calculations, save correction constants, accumulate and process the obtained data, analyze these received data, exchange data with a computer, etc. So, the work is aimed at developing a methodology that will allow the simultaneous measurement of power and luminous flux of planar light sources. And also on the feasibility of this technique in the device and software with the ability to measure the power of the light source in an arbitrary band of the spectral visible range. Thus, it is possible to determine what power in watts a light source emits with the dynamics of supply currents in the optical bands, knowing the spectrum of this source without using glass filters. So, the result of applying the technique is to determine the power of light radiation (in watts) or the luminous flux (in lumens) of the emitter (light sources).
Highlights
It is generally accepted that when choosing a light source, consumers tend to focus on the higher energy efficiency of light sources
The first drawback is the rather low color rendering index (CRI) [2], that is, a measure of the ability of a light source to adequately reflect the colors of illuminated objects, compared to a natural light source
Measurement of luminous flux. – (A) The device measures the photocurrent induced by the light source. – (B) The spectrometer measures the dependence of the intensity of this source on the wavelength. – (C) The dependence of the quantum yield of photo diodes on the wavelength is known from the documentation for the device. – Knowing the dependences of the B and C distribution and taking into account the recommendations of the CIE (International Commission of Illumination), the contribution of each spectrum component to the total luminous flux created by the light source is calculated and the luminous flux created by the light source is calculated
Summary
It is generally accepted that when choosing a light source, consumers tend to focus on the higher energy efficiency of light sources. Compared to traditional light sources, inorganic LEDs demonstrate a fairly high efficiency, which at present can be almost twice as high as that of fluorescent lamps [1]. When it comes to color quality, both inorganic LEDs and fluorescent lights have at least two disadvantages. The second drawback is the shift of radiation to the blue region of the spectrum, which to a certain extent is dangerous to human health [3] In this context, in organic light-emitting diodes, white radiation (WOLED) harmful blue radiation can be largely eliminated by design and technology approaches [4]. The aim of research is to develop a portable device that makes simultaneous measurement of power and luminous flux
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