As global warming,
energy shortages, and environment pollution
have intensified, low-carbon and energy-saving lighting technology
has attracted great attention worldwide. Light emitting diodes (LEDs)
have been around for decades and are considered to be the most ideal
lighting technology currently due to their high luminescence efficiency
(LE) and long lifespan. Besides, along with the development of modern
technology, lighting technologies with higher performance and more
functions are desired. Perovskite based LEDs (PeLEDs) have recently
emerged as ideal candidates for lighting technology owing to the extraordinary
photoelectric properties of perovskite, such as high photoluminescence
quantum yields (PLQYs), easy wavelength tuning, and low-cost synthesis.
Herein, we open this review by introducing the background of white
LEDs (WLEDs), including their light-emitting mechanism, typical characteristics,
and key indicators in applications. Then, four main approaches to
fabricate WLEDs are discussed and compared. After that, in accordance
with the four categories, we focus on the recent progress of white
PeLEDs (Pe-WLEDs), followed by the challenges and opportunities for
Pe-WLEDs in practical application. Meanwhile, some pertinent countermeasures
to their challenges are put forward. Finally, the development promise
of Pe-WLEDs is explored.
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