We report the influence of laser irradiation on photoluminescence (PL) intensity to study the evolution of nonradiative recombination centers in GaP1−xNx alloys. PL mapping measurements confirmed that defects to act as nonradiative recombination centers are permanently generated by laser irradiation, which results in irreversible degradation of the PL intensity. Real-time PL measurements revealed that stronger laser irradiation leads to a larger and faster decrease in the PL intensity with irradiation time. The decay of the PL intensity by laser irradiation is larger and faster for a lower nitrogen concentration, indicating that samples with a lower nitrogen concentration are abound with hidden defects to act as nonradiative recombination centers by laser irradiation. It was demonstrated that PL measurement using high-power density photoexcitation is useful to evaluate the generation or multiplication of irradiation-induced nonradiative defects, which causes the deterioration of optoelectronic devices during operation.

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In most parts of the industrial and domestic applications vigilance is important and many problems can occur due to a lack of proper temperature monitoring system. In this project we will monitor the temperature in our local area.Internet of Things (IoT) is the latest concept of relating to physical devices or other objects to online and are able to connect with others. Each item says provided with different identifiers and data transfer capabilities via an internet network without human and machine intervention communication. The project aims at a simple microcontroller, NodeMCU for wireless weather monitoring and monitoring system, WiFi-WeMos ESP8266 weather monitor uses many senses such as heat, rain and carbon monoxide sensor. Then show all data in Blynk application. The project was developed using NodeMCU Microcontroller, WiFi-WeMos ESP8266, DHT 11 temperature and humidity sensor, rain sensor and MQ-7 Carbon monoxide sensor etc. It is advisable to monitor the weather in any case, any location and anytime.