Perovskite　quantum　dots　are　considered　to　be　one　of　the　most　promising　materials　for　next-generation　backlight　displays　due　to　their　narrow　emission　width,　high　color　purity　and　tunable　luminescence.　However,　the　deterioration　and　failure　of　perovskite　quantum　dots　under　stimulation　from　the　external　environment　(e.g.,　light,　heat,　and　humid　air)　limit　their　practical　applications.　Herein,　CsPbBr3@glass　with　excellent　stability　and　optical　properties　was　successfully　prepared　by　optimizing　the　quantum　dot　nucleation/growth　conditions.　The　CsPbBr3@glass@PDMS　hierarchical　structure　film　with　a　full　width　at　half　maximum　of　similar　to　17　nm　and　photoluminescence　quantum　yield　of　similar　to　80%　was　obtained　via　the　physical　dilution　method　to　eliminate　the　internal　filtering　effect.　Benefiting　from　the　dual　protection　of　the　inorganic　glass　network　and　PDMS　polymer　matrix,　the　film　exhibited　excellent　water/heat　resistance.　As　an　application　demonstration,　a　white　LED　backlit　unit　was　designed　by　coupling　a　CsPbBr3@glass@PDMS　green　film　and　Mn4+:K2SiF6　red　film　with　a　home-made　blue　light　guide　panel,　endowing　the　LCD　with　a　wide　color　gamut　(a　color　gamut　of　159%　for　commercial　LCD,　108%　for　NTSC,　and　81%　for　Rec.　2020),　confirming　its　great　potential　in　the　display　industry.