Tunable-Color UV-Excitation Sb³⁺/(Bi³⁺, Ag⁺)-Doped Cs₂NaInCl₆ Perovskite for High-Color-Rendering Full-Spectrum w-LEDs

Abstract

Traditional white light-emitting diodes (w-LEDs) have a cyan gap between 480 and 520 nm, which leads to the reduction of color vividness. Herein, a new combination strategy is proposed to prepare the full-spectrum w-LEDs: the blue phosphors and broad orange-yellow phosphors originated from Cs2NaInCl6 are blended on an ultraviolet (UV) chip. We obtained the blue phosphors and broadband orange-yellow phosphors by introducing Sb3+ and Ag+/Bi3+, respectively, into Cs2NaInCl6. Cs2NaIn0.97Cl6:0.03Sb3+ and Cs2Na0.9Ag0.1In1–y Cl6:yBi3+ (y = 0.03, 0.1, 0.2, 0.6, and 1) were employed for fabricating a series of full-spectrum w-LED devices with a 340 nm UV chip. The obtained white LED (Cs2NaIn0.97Cl6:0.03Sb3++Cs2Na0.9Ag0.1In0.8Cl6:0.2Bi3+) shows a high color rendering index of 93.6 and a low correlation color temperature (CCT = 4986 K). This work provides a new direction for the fabrication of full-spectrum w-LEDs.

Bi3+/Sb3+ co-doped Cs2HfCl6 vacancy-ordered double perovskites for multifunctional optoelectronic applications

“…Unfortunately, the intrinsic luminescence of Cs 2 HfCl 6 necessitates an excitation wavelength of higher energy (o260 nm), posing a challenge for its practical implementation in commercial phosphors for white light emitting diodes (WLEDs). Doping is a virtual way to improve luminous efficiency and enrich the emission band, 23 which have been widely studied in DPs such as Cs 2 SnCl 6 [24][25][26][27] and Cs 2 NaInCl 6 28,29 systems.…”

“…Doping is a virtual way to improve luminous efficiency and enrich the emission band, 23 which have been widely studied in DPs such as Cs 2 SnCl 6 24–27 and Cs 2 NaInCl 6 28,29 systems. However, concentrating on the incorporation of single ns 2 -type ions, extensive research has been carried out thus far in the Cs 2 HfCl 6 system to unlock their potential in solid-state lighting.…”

Thermally Induced Morphological and Structural Transformations on Eu2+/Eu3+-Coactivated Calcium Silicate Nanophosphors

“…These limitations render this method unsuitable for critical applications. , An alternative approach has emerged aiming to improve the quality of white light emitted by LEDs while achieving a higher CRI. This approach involves employing a UV LED chip emitting 300–410 nm and coating it with three distinct phosphors emitting blue, green, and red light. − Despite its promise, this method causes the reabsorption of blue light from red- and green-emitting phosphors and a substantially decreased Stokes shift. This collectively lead to reduced luminous efficiency. − Rare-earth ion-containing full-color-emitting phosphors could overcome such challenges, owing to their exceptional luminescent properties, minimal color aberration, and enhanced color rendering.…”