White light emission is typically achieved through the composition of near-UV or blue LEDs with a coating of either down-conversion materials, such as YAG: Ce^{3+<\/sup>\u00a0phosphors, or a combination of red and green phosphors.<\/p>\n}

Unfortunately, WLEDs constructed through this method suffer from poor white light performance after extensive utilisation, due to the different degradation rates between the blue LEDs and phosphors.<\/p>\n

In addition to this, WLEDs generally exhibit unsatisfactory high correlated colour temperature (CCT) value and a low colour rendering index (CRI <80) due to the facile absence of the red or green emission.<\/p>\n

Therefore, an optimum white light emitting system needs the light source with an appropriate CCT between 2500 and 6500 K, and CRI above 80. Among the luminescent materials discovered so far, CsPbBr_{3<\/sub> perovskite quantum dots (QDs) have been recognised as one of the most promising candidates for WLEDs due to the excellent optoelectronic properties.<\/p>\n}

How did scientists use quantum dots to create sufficient WLEDs?<\/h3>\n

Professor Zhigang Zang, leader of the study from Chongqing University, presents a facile strategy to achieve excellent stability of CsPbBr_{3<\/sub>\u00a0quantum dots, and high performance of WLEDs by using shorter 2-hexyldecanoic acid (DA) ligand to replace OA ligand for CsPbBr3<\/sub>\u00a0quantum dots.<\/p>\n}

The ligand modified CsPbBr_{3<\/sub> quantum dots exhibit a high PLQY of 96% with significantly enhanced stability, even when exposed to ethanol and water environments. Consequently, modified CsPbBr3<\/sub> quantum dots and red AgInZnS quantum dots are created by employing WLEDs and combining a blue InGaN LED with green ligand, which generates high quality warm white light emission.<\/p>\n}

Scientists concluded that WLEDs created from the modified CsPbBr_{3<\/sub> quantum dots portray a good thermal performance under high driving current, therefore verifying their potential application in the field of solid-state lighting.<\/p>\n","protected":false},"excerpt":{"rendered":"}

A research team from Chongqing University, China, have discovered warm white light-emitting with high, efficient emission and high colour rendering index by using ligand modified CsPbBr3\u00a0quantum dots. How does this help the world\u2019s energy consumption? Lighting currently accounts for roughly one-fifth of the global electricity consumption, which leads to a large increase in the emissions […]<\/p>\n","protected":false},"author":21,"featured_media":17661,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[24615],"tags":[24128,651,821,17008],"acf":[],"yoast_head":"\n